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Ar aed et en toatin Lor dy tatnaty * Sete

TRANSACTIONS

AMERICAN

ENTOMOLOGICAL SOCIETY,

PROCEE DINGS ENTOMOLOGICA L SECTION

ACADEMY OF NATURAL SCIENCES.

VOL. Xi.

PHILADELPHIA:

GEORGE B. CRESSON, ENTOMOLOGICAL PRINTER.

1884.

Sa

CONTENTS /OLUME.

FRONTISPIECE. Portrait of Dr. John Lawrence LeConte.

AARON, S. FRANK. Descriptions of new Psocidze in the collection of the Amer- ican Entomological Society

Casry, Thomas L. Revision of the Cucujidee of America north of Mexico

Epwarps, Wiuuiam H. Revised Catalogue of the Diurnal Lepidopte ra of America north of Mexico

Enters, W. (of Cartagena, Spain.) Descriptions of new blind Bembidii

Horn, Grorce H. M. D. Notes on the species of Anomala inhabiting the United States : Synopsis of the United States species of Notoxus and Me- cynotarsus ; : Synopsis of the Philonthi of areal America .

Marruews, Rey. A. (of Gumley, England.) Synopsis of the North American Trichopterygide

ScuppErR, SamurL H. A biographical sketch of Dr. John Lawrence LeConte

Smits, JouHn B. Synopsis of the Apioninze of North America .

Wi.uiston, S. W., M. D. On the North American Asilidze (Dasypogine, Laphrinze ) with a new genus of Syrphidee

Proceedings of the Meetings of the Entomological Section from Sept. 13, 1883, to Dec. 8, 1884

we =I

69

245

165 Lit

113

41

XXIX

TRANSACTIONS

OF THE

AMERICAN ENTOMOLOGICAL SOCIETY.

VOLUME XI.

On the North American ASILIDAE (Dasypogoninae, La- phrinae), with a new genus of SYRPHIDAE.

BY SS. oWe WLELISTON,S M.D.

In the following pages I have endeavored to tabulate the genera of Dasypogoninae and Laphrinae from the United States. The genera Sphageus from Cuba, Archilestris, Lastaurus, Megapoda and Pseudorus from Mexico and Psilocurus from Texas are not included, all of which have but one known species each. Dézonias (1 sp. Tex. and Fla.) and Blacodes (1 sp. Texas) are unknown to me and their positions have hence from necessity been wholly drawn from figures and descriptions. On the other hand there are added Triclis, Habropogon, Hyperechia and Maria, not hitherto recorded from North America; whether cor- rectly or not the detailed descriptions I trust will show. A new generic name is also proposed, and the earlier name of Deromyia adopted for the species of Diogmites. Laparus ? pictitarsis Bigot from California does not belong in that genus, nor can it be well placed with Cadlinicus to which it is most nearly allied. Moreover several species now placed under Cyrtopogon are provisional, and will some time require generic separation. Altogether then, with the genera and species herein added, thirty-five genera with one hundred and twenty-five species of Dasypo- goninae and eleven genera with fifty species of Laphrinae represent the extent of our knowledge in these two sub-families in North America.

The Asilinae are but little known. From the Western regions I know three species of Mallophora, three of Promachus, three or four of Proctacanthus, five or six of Hrax, with others of Tolmerus, Machimus, and a number whose positions [ am in doubt about. Om- matius, two species of which I know from New England and Georgia, I have not yet seen elsewhere.

TRANS. AMER. ENT. SOC. XI. (1) DECEMBER, 1883.

bo

S. W. WILLISTON, M. D.

In using the table, the terminal spur of the front tibiae should be sought for with care; in some of the species it is very small. It hes across the inside of the joint between the tibia and metatarsus, and is

more or less oblique and bent.

Table of genera of the N. A. DAsyPOGONINAE and LAPHRINAE (north of Mexico).

A. DASYPOGONINA

1.—Front tibiae with a terminal claw like spur.... .......-::eeeeseeeeee Beenie oe teeta 27. Front tibiae without Such SPUL......cccsceeseesee eee ceneee reseee cence seeeae ceaees sense ees 2. 2.—Pulvilli rudimentary or wanting...........sse0seeeeeeee Pears enp ate eeatl -atenleneceneer 3. Pulvilli normal.......... UM eese eacisn ca cene ase oeansieneecs ees Pee aacnectece neni case te cane nieceentteee 4.

3. —Face very narrow; abdomen very long, slender, narrow on proximal part; hind A legs elongate, SlENGer.......ceseeceeceeeee ceeeeeseeeee ceeeeeeee seeeeees Leptogaster. Face moderately narrow; abdomen not unusually long, broader at base; hind legs not elongate. ....ccceeccccceees ceeesseeseeeecneeeees conees cones Ablautatus.

4.—Head narrow. about us high as broad; face narrow above, broader and swollen below, in large part covered with hair. Large elongate species...5.

Head very obviously broader than bigh.......:s:se+seseeeeseseseee scene seneee conneeeeees ie —Antennae with a terminal style Pee ee ened secant aba tdisecnineceneiscionsetecsacneelnadmeterte pot the Third joint of antennae very ‘long. without style; fourth pone cell closed

before the border of the wing. Black species with or without red on the

ACL OME Teen eesseeers aati ec ore meet steaeiceetenes ene ect ssantieenertanes sets Ospriocerus. 6.—First posterior cell open, not closed before the border of the wing. Stenopogon. First and fourth posterior cells closed before the border of the wing; third joint of antennae shorter, style longer..........:+..-. +... Scleropogon, 7.—Fourth posterior cell closed before the Herder: Uteead vaene con cnmeeseereec ess ion eacemt eect 8. Fourth posterior Gil wide open, rarely nearly closed....-.........-.-..-. seo-neeee 12. 8.—Antennae elongate, of five joints (Myelaphus)......cc.-cecesssses senses ceceeees secant 13. Antennae not elongate, of three joints, and a terminal style............--s.e. sees Oe

9.—Face bare, except on oral margin; abdomen elongate, cylindroidal; anterior intercalary vein continuous, or nearly so, with the fourth vein, the last section of fourth vein oblique, sinuous, closing or much narrowing the broad first posterior cell. Large, or very large species..... Wicrostylum.

Face pilose or hairy, MOre CONVEX «2... sceeseees cesses seneee eeeeee ceases ceeeesees ceeeeeees 10. 10.—Abdomen eylindrical, not narrow at the tip, elongate; near the base of second and third segments with white pollinose emarginate cross-bands ;

Wings blackish. cscs. ques <ocenscneaseicncvorlencucnsne soecenen ines snaneninans . Dizonias. Abdomen less elongate, with five or six white pollinose cross-bands .......+- alts

- 11.—First posterior cell open, scarcely narrowed, face broad.......... Laphystia. First posterior cell much narrowed, or closed ........ Sige osessalsvsscmereees Triclis. 12.—Antennae elongate, composed of five joints; nearly bare species...........+- 15. Antennae less elongate or short, of three joints, with or without a short or BlOMCeruStival Ones eters ssencicccee sr sceam sactesansi ents slenceanitse=st senate (ohana 14,

13.—First and second joints of antennae of nearly equal length, third elongate, fourth short, fifth elongate and densely pubescent, third and fourth not VODGU AUN Otceneseteesectterenecns*sMccheersnicsets.geeceer tata leeree ....Ceraturgus.

AMERICAN DIPTERA. 3

First joint about three times as long as the second, third elongate, fourth and fifth of nearly equal length, third and fourth at the tip with two lobes, or processes, reaching to about the middle of the following joint.

Myelaphus.

14.—Style of antennae short, thick. obtuse, not easily distinguished from the third joint, or if so, forming an apparent joint. Small or rather small species, nearly bare, shining or metallic black, with narrow or cylindrical abdo-

men and large wings; face flattened, bare except below, hind tibiae pilose

MIT LP OMA TEAS CL Gue ate cictesnrs Aten aLayesia tee eScers, lech sscesscxsteianesSvasivasine seesesatace’ 15.

Terminal style small, more slender than the joint, apparent, antennz shorter if elongate and style indistinguishable; the oe not bare but thickly

pilose:............ Bee Deedee tensteerensis sseweiresnwadat weata ta oe eG 15.—All the tibiae and. ine hind hin Sait short sang setee.. _ Nethodopa. EMM MSM OTs) Wilt OUt SUCHISCULC. 5. sdo<icncessstonsscesesseseasecascoassy #0 s¥s- Dioctria. 16.—Face distinetly convex in profile, swollen or gibbose*............... Vosceueecanaise ie Hacealaivenecsonny Cnthy COMMER. <2. xcloasdssio4senciassaei/2c vex: dovesacel weeansieerurmisreons 19.

17.—Head as broad or broader than the thorax, front at base of antennae flattened, not projecting in profile; terminal style of antennae slender or differ-

EMU ALO GMO MMMM Ol Masesvencceesstyociesaciverte] cnecchiacsess tecvsriteeseriestcwctes sali

Head narrow. Antennae sensed upon a convexity, thence rece ane. eo the facial tubercle which is at the lower part of the face; antennae elongate,

style short, obtuse; abdomen short; thickly pilose species, the bristles few

SUIDCB ID OSs aachecea-cananvcesaes staceesnsecsssscbeseaitivecnsisgaveneso sins Dicolonus. 18.—Thickly pilose species: the eibbostty of the face reaches to the base of the antennae; anal cell usually open*..................4 ..Cyrtopogon. Thinly pilose, more pollinose species, are convexity of the face on the lower part; anal celliusually closed \..::.......:00001-0-esectens . Daulopogon,. 19.—Abdomen elongate; front broad anteriorly, narrow behinds. -_Plesiomma. HOME TOU BMRATO We CANE NANG <tuursstis dcticcssceace saccenaeel'ug ove. cuavceussenmousidessuacermes 20.

20.—Hind tibiae toward the tip, and their metatarsi, much thickened..............21. Hind tibiae not, or but Eee thickened toward the tip; metatarsi not

thickened .. Mean aacsacieas suman deh os’ Acusias sidasic Baader ss cssereeuee seas 21.—Head much pioedee tea Bish transverse, Sedeapates? like; epieien short, MUMS RANE Gisa ony seedacsereienc scr sii vedatleniest es oedoseeecsaacaees Holecocephala.

Head only ae broader than high, not at all spectacle-like in appear- ance.. mite Se Ase .. Holopogon.

22. SS menien with thick rec marabaeit pile Shans i thicicly Alea: species; antennae slender.. piece cs sreenienee PY EMOPOEON. Abdomen without Bice poife age Meepenc(mesignt raceatiesWeun(caier oo ert oe 23.—Slender, nearly bare species; face perpendicular, straight or oently concave, narrowed above. bare, except on Oral MALgiMN..........cersccsecersenrsececcscseea de

Face gently rounded, not prominent pat in large part hairy, not or but slightly narrowed above............ , au apse ceri

24.—Thickly whitish pollinose; cabdonien: nalsuen choall pelleted upward, third joint of antennae and style both slender............. S$tichopogon.

* Several species are placed provisionally under Cyrtopogon in which the facial gibbosity is small, and the body thinly pilose. They may be distinguished by the abdomen not being broad, and having white pollinose cross-bands; in some the wings have small but distinet clouds on the cross-veins.

4 S. W. WILLISTON, M. D.

Less thickly pollinose ; abdomen cylindrical, a little broader at base; third

joint of antenne short, broad, style minute....... 2 Habropogon. 2h.—Large, elongate species, style of antennee short.....................Callinicus. Moderately large, not much elongate.......s.s:sseeeeeeee Suseeie roaster cose Ue

26.—Abdomen broader at the base, depressed ; thorax much convex above, anten- ne slender, style long and slender (compare species of Cyrtopogon).

Anisopogon.

Abdomen short, cylindrical, antennz moderately long, style short. Black

with bright golden yellow opaque pollinose markings on thorax and

abdomen.....c.eee Fe ueahuidenerarsentesenasios ‘*Laparus?’”’ (pictitarsis Big.)

27.—Large species; face ae with bristles on the oral margin, in ee ae

or concave, the oral margin ProjeCtiNg.........ceereeceecsereecee see serees ..28.

Smaller species; face convex on lower ponticts not projecting............. an

28.—Elongate; fourth ee cell closed, mere a considerable distance before

the margin. eae eaenebateieaciedeisind setet acttccleameaeiwenisaciensIas .. Deromyia.

Less Elonrare: ; ‘banth ‘cell open or elesed in the margin, rarely a little

petiolate oc. cesececece cesceecesssetereteteeseeesscereeeressessesasesesse SAPOPOZOM,

29.—Head broad and flat, face ae gibbose, Aree joint of antennz slender,

elongate.. saea0e epieceeatmne acts saidewinacoesmmmiseeisente aces etre ntes ste stneetaecteeetent 30.

Head only a aorately: proader ‘en isthe ; face gibbose below; third joint of

antenne more or less dilated, style very short ; thorax and legs with numer-

ous bristles; abdomen broadest at the base, rather slender, subeylindrical.

Lestomyia n. g.

30.—Abdomen finely punctulate, of nearly equal width, hind tibiz at the tip and

their tarsi only a little thickened; wings hyaline......... .. Taracticus.

Abdomen smooth; hind tibiz at their tip and their tarsi thickened (compare

here Nicocles ? scitula); antennal style slender, acuminate; wings varie-

ated....reesseccccsereeececsccsesserere scenes ceeweceesseesee assess seceeseneensceseneseesensasens 31

31.— Abdomen flattened; in the female a little broader beyond the middle; in the male near the tip, the last two segments of which conspicuously silvery.

Nicocles. Abdomen of nearly equal width throughout, the last segment in the male not silvery, fourth posterior cell narrowed........ sss Blacodes.

B. LAPHRINAE.—Mareinal cell of the wing closed, antennze without a terminal bristle.

1.—The veins at the distal ends of the discal and fourth ae cells in the same straight line, continuous, or nearly s0............ seeosieatnnae peeereen aneae

The veins, ete., not in the same strarehe line, me vein closing ie ere pos- terior cell more or less remote and oblique.............. Soca ne ae eiane caneenerls 2.—First joint of antennae elongate, slender; scent posterior call narrowed toward the margin of the wing......... ecaisuse coeemecetacece .. Cerotainia.

First joint of the antennze much shorter then the third’; first posterior cell narrowed or closed, the second wide open.............::.:...- AEOMOSiIa, 3.—First posterior cell narrowed or Closed................sesescecceceenceeeeececseeneecer eee nen de First posterior cell wide ae aes eet ste ats eee eee een = 4.—Three submarginal cells, 1. e. ion upper paneh of the htt vein is connate with the second by a Leet VOID... ceeceeeecteseeeseeeeterssee see OLONOSOMA.

Woe Man HUMAN COM newerecausetoasccsenesenoclssilascivshlccsleusteeelerctceisesiereliacts Meter entrettee) a

AMERICAN DIPTERA. 0

5.—Hind femora of nearly equal thickness throughout; antenne with a distinet terminal style; very large, robust, thickly pilose species.... Myperechia.

Hind femora thickened toward the end; antenne without terminal style ; more elongate, less pilose species..... .....0:..0:s ee ANGrenosoma.,. 6.—Thorax and abdomen nearly or quite bare............ Thorax and abdomen thickly pilose, larger species : 7.—Hind femora with spinous tubercles below............0.:0:eeeeee ee AM pPia, Hind femora without spinous tubercles below.. .... Secatenedes Seeley .. Maira, 8.—Densely pilose species; the abdomen short, broad, usually broader beyond the middle, in the male sometimes more elongate ; proboscis thick.... Dasy lis.

Less pilose, more elongate species; proboscis more elongate and slender. Laphria.

MYELAPHUS. Bigot, Bulletin Soc. Ent. de France 1882, No. 9. p. 112. Ceraturgus Osten Sacken (parte).

This proposed new genus of Dasypogoninae has been insutticiently characterized by its author, with a very brief diagnosis of the type species as follows:

“Myelaphus melas §.—Long. 15 mm. Totus niger, abdomine nitido ; halteribus ct pulvillis flavis ; alis nigris, intus et apice parum dilutioribus. Oculis nudis.—California.”

I have before me a specimen which I believe to be this, together with two other species closely allied, and which appear to offer sufficient char- acters to justify their separation from Ceraturgus, under which one of them had been described by Baron Osten Sacken. From the light that these species afford on the value of the characters in this genus and Cera- turgus it seems desirable to give the structural and specifie characters in detail.

Head broader than the thorax, considerably broader than high. Face a little less than a third as wide as the head, its sides very nearly parallel, diverging but very slightly below, bare, smooth and shining, on the oral margin in front with a thin row of moderately long bristles; in profile gently receding, aboye the middle with a moderately large obtuse tubercle (wanting in M. lobicornis), not reaching quite as far forward as the base of the antennae, between which it is gently con- save, and below the tubercle to the oral’ margin considerably receding, nearly straight; the oral margin in front is distinctly above the lower borders of the eyes, so that the lateral margins of the mouth are considerably oblique, and straight. Antenne situated upon a large obtuse tubercle, about as long as the dorsum of the thorax, composed of five joints as in Ceraturgus, all of which are distinctly separated from each other: first joint cylindrical, elongate, rather more than three times as long as the second; second joint short, but little longer than broad ; third joint distinctly longer than the first two together, somewhat com- pressed, only a little broader, terminating in two lateral lobes, or processes, which extend as far as the insertion of the second joint of the style; fourth joint, or first joint of the style, somewhat Y shaped, the terminal lobes being rather more than one-half of the entire length of the joint, longer and more slender than those of

(2)

6 Ss sie Sau S TONGS ave eID:

the third joint; fifth joint, or second joint.of the style, longer than the entire length of the preceding, narrowed, almost pedicellate at the base, flattened beyond the tip of the lobes of the preceding joint, and then obtusely pointed, somewhat irregular in shape and shallowly suleate, clothed with very fine short pile.

Thorax convex, nearly bare, wholly without macrochaetae except a few very short intra-alar ones. Legs rather stout, without macrochaetae except a few short ones at the tips of tibiae and the basal tarsal joints. Wings as in Ceraturgus cruciatus, but broader, marginal and first posterior cells open ; the posterior inter- calary vein arises from the posterior basal transverse vein a short distance from the base of the diseal cell. In M. melas the type and M. rufus (new sp.) the fourth posterior cell is broadly open, in M. lobicornis closed and petiolate. An- terior ecross-vein near middle of the discal cell.

Abdomen in structure rather like that of Dioctria, shorter than the wings, the sides nearly parallel, or gently concave, to the tip of the fifth seement in the male, in the female the fifth segment gently narrowed behind; a little narrower than the thorax in the male, in the female about as wide; flattened, so that transverse- ly it is only gently convex above, gently grooved at the incisures, each segment being gently convex longitudinally ; smooth, nearly bare, except sparse very short pile; segments of nearly equal length, the sixth a little shorter, the seventh very short. Hypopygium small.

This description is drawn from a male of J. melas and a female J. rufus which agree closely in structure. In MW. /obicornis the antennal pro- tuberance is more obtuse, and the face more flattened, in profile very narrow, and the prominence near the, middle wholly wanting. The fourth posterior cell is also closed a little before the margin of the wing, and the first posterior cell strongly coarctate.

From the diagnosis of this genus given by Mr. Bigot, there are some differences, which might render the recognition doubtful. The antennae are not as long as the head and thorax combined, but considerably shorter, and the third joint is at least a half longer than the first; the third joint has two processes like the fourth joint. There are but two joints in the style, as in Ceraturgus. From the irregular shape of the last joint, it might be thought to be divided, but such is not the case. Three Joints in the style would be anomalous I think.

l. Myelaphus melas.

? Myelaphus melas Bigot, 1. e.

% -—Black, abdomen shining; halteres and pulvilli yellow; wings black, more dilute behind and at the tip. Length, 144 mm. Face smooth, shining, bare, in the middle on the tubercle broadly and indefinitely pitchy red; bristles on the oral margin yellowish white with one or two black ones on the sides; beard short, sparse, black. Front on the sides near the eye with a few short black bristles. Antennae wholly black; on the upper sides of the first and second joints. with a few short black hairs. Thorax deep shining black, above with a blue reflection, the dorsum wholly without markings, but covered with very short sparse black hairs; a minute spot on the humeri red, and the post-alar callosities pitchy black. Pleurae very smooth, shining, except on the upper part of the sternopleurae,

AMERICAN DIPTERA. 7

and on the mesopleurae, where it is moderately thickly covered with short pile, black above, whitish below. All the coxae on their outer sides with sparse whitish pile, and at their lower ends with a few short whitish bristles. Halteres yellow, the extreme base a little brownish. Abdomen shining black, with very short, rather sparse black hairs, slightly intermixed with whitish on the sides of each segment; on the hypopygium with longer light yellowish or whitish pile. Legs “deep black, the front and middle knees very narrowly yellowish, the pulvilli and base of claws light yellow: on the front tibiae below, their tarsi and on the mid- dle tarsi less so. with reddish pubescence. Wings blackish on the anterior portion toward the base, along the posterior and outer part more dilute, but still slightly tinged with brown or blackish; first posterior cell not at all narrowed at the margin, fourth posterior cell broadly open, the fifth vein at the tip slightly curved backward. One specimen, Kern Co., California.

2. Myelaphus rufus, ». sp.

© .—Yellowish red; third joint of antennae and the style, proboscis, occiput, three broad, abbreviated stripes on the dorsum of the thorax, two spots on the lower part of pleurae, and tips of claws black. Length 17 mm.

Face, front, and first two joints of antennae reddish yellow, shining, the face be- low, near the eyes, and on each side of the base of the antennae lightly yellowish dusted. Bristles of the oral margin yellowish white; on the sides of the front a few shorter ones yellow. Third joint of antennae and the style deep black. Pro- boscis black, the palpi vellowish. Oeciput black, thickly yellowish pollinose on the sides; oceipito-orbital bristles short, thin, and like the sparse short beard below are yellow. Dorsum of thorax yellowish red, with three broad black stripes. separated from each other by linear intervals; the lateral ones begin some distance behind the humeri and extend to within a short distance of the scutel- lum, on the posterior part narrow; the middle one begins at the prothorax and has well defined edges to the transverse suture, immediately behind the suture the stripe becomes obsolete. The dorsum is clothed with short, not very abundant golden pile, and has three or four short, inconspicuous, yellow, intra-alar bristles. Pleurae yellowish red, except a large spot above the middle coxae, and another nearly confluent, smaller one above the hind coxae, which are smooth, shining, pitehy black. On the mesopleurae and upper part of the sternopleurae with golden yellow pile, moderately dense; just beyond this there is a smooth shining space. Halteres yellow. Abdomen wholly red, darker, somewhat ferruginous along the dorsum; very shining and clothed with sparse, short golden pile. Legs wholly reddish yellow, the tips of the claws only black; pulvilli and the base of the tibiae lighter colored, the coxae on their outer sides with whitish pile. Wings very distinctly blackish clouded on the outer part, the veins blackish, at the base the veins and cells are yellow. First and fourth posterior cells a little more nar- row at their outer parts than in M. medas.

One specimen, Kern Co., California (H. K. Morrison).

It is probably that, as in the following species, the wings in the male may be, not yellow, but brown or blackish toward the base.

3. Myelaphus lobicornis.

Ceraturgus lobicornis Osten Sacken, Western Dipt. 287.

“© ©.—Head and thorax wholly black, coxae, trochanters, more or less of the base*of the four front femora, tips of tarsi, narrow base and lateral margins of

8 SoWe WILLISTON: 2D.

abdomen black or blackish; legs and abdomen yellowish red. Wings in the male tinged with brown, darker, sometimes dark brown in front toward the base; in female the basal half yellowish, the posterior and distal half brownish.” (Face nearly plane, without tubercle. Wings comparatively narrow ; first posterior cell coarctate, fourth posterior cell closed and petiolate). Length 10-12 mm.

I have a single male specimen from Kern Co., that I believe to be, this. It agrees very well indeed with the original description, except that all the femora from the very trochanters are reddish yellow, the venter is red and the wings are dark brown before the anterior cross-vein, beyoud which there is a large space very nearly hyaline; the posterior portion for the whole length has a distinct blackish tinge. However, these differences are such as Baron Osten Sacken himself noted, or an- ticipated. The only reason that I am at all doubtful of the identity is that the author did not speak of the closed and briefly petiolate fourth posterior cell, a character, however, that is probably more or less varia- ble. The hind femora in this species are stouter and more thickened on the proximal portion than in the preceding species.

DIOCTRIA, 4. Dioctria nitida n. sp.

% Q.—Black shining, thorax yellow pilose and pollinose, mystax black; tibiae yellow, tips black. Length 11-15 mm.

Much like D. albus but larger and all the tibiae ight reddish-yellow, except the tips. Face bright golden yellow, mystax and pile of the front black. Antennae in structure quite like those of D. albius, black. Thorax rather thickly clothed with golden-yellow pollen and pile. Pleu- rae shining black, with four rather small patches of dense yellowish-gray pollen, and similar ones on all the coxae, the front and middle coxae with white pile. Abdomen deep, shining, somewhat metallic, black. Legs black, front and middle tibiae except the immediate tips, and the hind pair a little more broadly, reddish-yellow. Wings nearly uniformily. blackish, veins yellow at the base.

Four males and one female, Washington Territory.

5. Dioctria albius Walker.

From comparison of five specimens from Washington Territory with thirty from Connecticut, [ am at a loss to find differences that will justify their separation.

6. Dioectria Sackeni n. sp.

%,.—Black, basal half of wings light yellow, distal half blackish; anterior femora below, tip of middle and hind femora, four front tibiae except their tip, and basal half of hind tibiae reddish-yellow. Length 7 mm.

Face yellow above, silvery below; mystax, pile of front, of antennae, and the beard white. Antennae black, rather acute at tip. Dorsum of thorax densely

AMERICAN DIPTERA. 9

covered with whitish-yellow pollen, the pile of nearly the same. color. Pleurae shining black, with small patches of yellowish-white pollen. Abdomen slender, wholly shining. Legs black, the front femora on the under side, the tip of middle femora and more or less along the under side, the hind femora at tip, the four front tibiae except the immediate tip and the hind tibie on rather more than the basal half, light reddish-yellow ; hind femora much thickened. Wings on the basal half light yellow, from the cross-veins blackish.

Three specimens, Washington Territory.

This species must be very similar to the specimen mentioned by Baron Osten Sacken in his Western Diptera p. 288, from the White Mts. The hind femora are comparatively more thickened than in D. albius.

:

LAPHYSTIA. 7. Laphystia sexfasciata.

Dasypogon 6-fasciatus Say, J. Acad. Phil. iii, 50, 1; Compl. Wr. ii. 64; Wiedeman, Auss. Zw. Ins. i, 408, 68.

Laphyctis sexfasciatus Schiner, Verh. Zool. Bot. Ges. 1866, 698.

Laphystia sexfasciata Loew, Berlin, Ent. Zeit. 1874; 373: Osten Sacken Cat. Dipt.; Bigot, Bull, Soc. Ent. Fr. 1879, 87.

Triclis notata Bigot, Annales Soc. Entom. France, 1878, 435; id. Bull. Soe. Ent. 1879, 87.

Laphystia subfasciata Bigot, ibid. Annales 1879, 256.

The genus Laphystia is intermediate in position between the Dasypo- goninae and Laphrinae. Our single authenticated species seems to have more affinity with Luphystia sabulicola Lw.than with Laphyctis gigan- tella Lw. and may therefore remain in this genus. In ZL. sexfuseiata the marginal cell is not closed, but distinctly open. I have therefore placed the genus under the Dasypogoninae. It resembles the following species, but has a wider face, and open first posterior cell.

TRICLIS. Loew, Bemerk Uber d. Fam. Asil. 17 (1851). Gastrichelius Rondani. 8 Trieclis tagax n. sp.—(Plate I, figs. 6. 6a.)

.—Black, whitish pollinose; head wholly with light pollen and pile; segments of abdomen with a large semicircle in front and the anterior angles shining. Wings hyaline. Length 65 mm.

Face thickly white pollinose, and with white hairs in the mystax, reaching nearly to the antennae; straight on the sides, in profile gently swollen below. Antennae black, first and second joints short, of nearly equal length, third broad, not longer than the first two together; style very small, short. Front faintly brown- ish ; oceiput thickly white pollinose on the sides; beard white. Thorax black, the dorsum thickly covered with short yellowish-white recumbent pile, along the middle in front a shining stripe; bristles slender, black. Pleurae thickly white pollinose, with a small shining black spot above the middle coxae ; scutellum pilose with a row of thin bristles along its edge. Abdomen short, moderately broad, not much narrowed posteriorly; shining black, the posterior margins of the seg- ments narrowly red, but obscured by the thick white pollen which leaves the black to form a large semioval spot, nearly reaching the hind margin in the

TRANS. AMER. ENT. SOC. XI. (3) DECEMBER, 1885.

10 S. W. WILLISTON, M. D.

middle and only narrowly separated from the small black spot on the anterior angles which extends to, or nearly to, the hind margin. A circle of long bristly hairs near the tip black; otherwise the short, not abundant pile, is yellowish, whitish or white. Legs black, rather thickly clothed with short fine white pile, along the under side of the hind femora and tibiae a little longer and more thickly erect pilose, as in Dioctria; bristles mostly white. Wings pure hyaline, the first posterior cell closed a little before or at the tip, the fourth at a considerable dis- tances before the border.

One specimen, Kern Co., California.

On account of the closed first posterior cell I place this species under Triclis, with which it seems to agree otherwise very well. Pstlocurus nu- diusculus Lw. is apparently related, but the first posterior cell is wide oped.

HABROPOGON Loew.

Dactiliseus Rondani.

A single specimen of a species from California seems either to belong to this genus or is closely allied. I have no specimens for comparison. Whether the structure of the face is the same [ do not know. In my specimen the mystax is confined to the oral margin as in Ntichopogon. I give therefore briefly the structural characters of the present species. I believe the genus has never been recorded from this continent.

In structure, except the head, throughout like species of Stenopogon, but less pilose. Head considerably broader than high, but scarcely as wide as the thorax. Face very narrow, the eyes separated by an ex- tremely narrow interval from the antennae ; their inner margins above and below gently divergent, so that the distance between the angles below is a little greater than that above. Face in profile gently concave from antennae to oral margin, nearly perpendicular, wholly bare, except a thin short row of soft bristles on the oral margin, which is projecting as in species of Stichopogon, Deromyia, and Saropogon ; front only gently excavated, widened above. Antennae short, first two joints of equal length, third a little longer than the first two together, broad, scarcely more than twice as long as wide, obtusely pointed at the tip and with a very small, almost microscopic style ; beard short and thin. Thorax bare, except with very minute hairs, and moderately strong, not abundant bristles on the back part; scutellum with four bristles. Abdomen slender, elongate, cylindrical, broader at the base, bare. Front and middle femora with two posterior preapical, and the hind femora with an anterior row of bristles. Fourth posterior cell nearly closed.

The head and antennae may perhaps be like those of Pstlocurus, but the face is much narrowed above, and wholly bare, except the bristles below; the abdomen is by no means “flach und gleich breit,” and has a star of spines at the tip in the female.

AMERICAN DIPTERA. 11

9. Habropogon bilineatus n. sp. (Plate I, fig. 8.)

©.—Black, gray pollinose, mystax white; dorsum of thorax yellowish-gray, with two slender opaque black stripes; 1-5 abdominal segments with red borders ; under side of all the femora and base of tibiae red. Length 15 mm., of wings 9 mm. :

Face and mystax white, the former opaque; front a little yellowish gray, the few short bristles black. Antennae and proboscis both short black. Dorsum of thorax gray with a yellowish or brownish cast, the ground color of humeri, post- alar callosities and seutellum appears to be yellowish red; in the middle two slender narrowly separated, but very distinct, opaque black stripes, obsolete in the posterior part; bristles wholly black. The ground color of the pleurae apparently in large part reddish, but concealed beneath dense, very light colored pollen, which also covers the coxae. Abdomen black, rather thinly yellowish grayish pollinose, the terminal segments more shining, the sides and posterior margins of the first—fourth segments and the sides of the fifth red; the pile is very short. Anterior and middle coxae thickly clothed with white pile. Legs black; the un- der side of all the femora broadly red, the base of hind tibiae and the four front tibiae, except their tip, red, or yellowish ted. Wings nearly hyaline, veins black.

One specimen N. California (O. ‘I. Baron ).

DICOLONUS. 10. Dicolonus simplex Loew, Centur vii, 56. (Plate I, fig. 4.)

I recognize this species in two male and one female specimens from Southern California. The pile, however, appears to be lighter colored, and in only one specimen is there any black pile on the front, and none have any at the tip of the abdomen.

CYRTOPOGON. ll. Cyrtopogon dasylioides ». sp.

*%,.—Black, thickly black pilose; mystax thick, light yellow; coxae with white pile. Abdomen, except the tip, with long, dense, furry, erect, light yellow pile; tarsi red; wings hyaline, the distal half in front blackish. Length 17 mm.

Face very thickly light yellowish pilose, on the lowest portion somewhat black ; beard white. Style of antennae short, thickened. Pile of the front, occiput, and of first two joints of antennae black. Thorax thickly black pilose, dorsum nearly opaque, on the sides of the middle in front a little brownish pollinose; bristles not strong. Scutellum thickly pilose, not pollinose, convex. Abdomen nearly parallel on the sides, shining, but its shape and color nearly concealed by the very long, erect, furry, yellow pile, the first segment with a very little black pile above on the sides, and the last segment and hypopygium wholly thickly black pilose. Coxae white pilose. Legs black, densely black pilose, hind tibiae deep red, all the tarsi lighter red, the front pair with white pile. Wings hyaline, the outer half in front from the margin of the third vein blackish, a little lighter at the tip, and fading out behind.

One specimen, Washington Territory.

This remarkable species falls into the group of I. A. aa. of Osten Sacken’s synoptical table (West. Dipt. p. 294) and is allied to C. aurifex QO. 8. from which it will be readily distinguished by its much larger size,

WE So W. WILLISTON, MD.

blackish cloud on outer part of wings, red tarsi and the more abundant, denser and wholly yellow pilosity of the abdomen, except its tip.

12. Cyrtopogon plausor 0. Sacken, West. Dipt. 297. Four male and one female specimens from Colorado agree perfectly with the description.

13. Cyrtopogon callipedilus Loew, 0. Sacken, West. Dipt. 296. A female from Southern Wyoming (alt 8000) agrees throughout with the description.

l4. Cyrtopogon praepes n. sp.

% 2.—Seutellum convex above, pilose: legs densely pilose, wholly black ; front tarsi of the male with a single row of silvery pile from the very base and the terminal joints of middle tarsi with a disk of black pile, longer than broad; sides of the abdomen at base white pilose, shorter and black on distal portion. Length 11—12 mm. °

%,.—Black, shining. Face thickly light yellowish pollinose, but concealed be- neath the dense light yellow mystax, black on the oral margin. Beard, anterior and middle coxae, first two segments of the abdomen on the sides, and all the femora below, and on the posterior part, thickly, nearly white pilose; front, upper part of the occiput, basal joints of the antennae, dorsum of thorax and scutellum, dorsum of abdomen and sides from the second segment, upper surface of femora and all the tibiae black pilose. Dorsum of thorax with two large spots on each . side of the middle in front, brownish pollinose; pleurae thickly light pollinose. Legs wholly deep black, the posterior tibiae at tip and their metatarsi with golden red pubescence. Legs not very stout, nor the bristles very strong; anterior tarsi slender, on their upper side for their whole length with a row of short; dense, silvery pile. not parted, except at the tip, the surface below is smooth, but along the sides there is a fringe of very short black bristles; two last joints of middle tarsi with the disk of black pile narrower than in the other species, longer than broad. Wings nearly hyaline.

Q .—Like the male, but the face is a little more bare upon the sides, the pile throughout somewhat shorter, the dorsum of the thorax more grayish pollinose in front leaving two slender medium dark stripes; the light pile of the abdomen is less abundant and extends on the sides to the fourth segment, and the black pile very short, on the posterior angles of the second, third and fourth abdominal segments there is a Small silvery spot; the pile of the femora is more obscure, the silver pile of the front, and the black disk of the middle tarsi wanting.

Two $ and two 2 specimens, Washington Territory.

This species is closely allied to callipedilus, cymbalista, plausor and the following:

15. Cyrtopogon np. sp.

Represented by three males and two females from Northern California. The males throughout are nearly like praepes, except in the tarsi, which are shorter, and the front and middle pairs are ornamented like cymbatlista is described to be, that is the first joint of the front pair has but little silvery

AMERICAN DIPTERA. 13

pile, and on the other joints it is parted so as to form two rows; the joints are wholly wanting in the black bristles, and the black disk of the middle pair is very broad. The female is difficult to distinguish from praepes, but the front tarsi are not so slender, and on the sides of the dorsum of the thorax, in front of the suture there is a large brown pol- linose spot which is wholly shining in praepes. There can be scarcely a doubt of the distinction of the two species, but I do not give it a name till larger collections have been examined. 16. Cyrtopogon profusus, 0. Sacken West. Dipt. 500.

A male from New Mexico (from Mr. EK. Keen) agrees very well with the description. 17. Cyrtopogon nugator Osten Sacken, West. Dipt. 307.

A male and female from Mt. Hood. The male has the second and third abdominal pollinose cross-bands narrowed in the middle, but entire.

1s. Cyrtopogon n. sp.

In size, shape and abdominal markings resembling C. nugator, but the markings of the thorax obscure and the ungues black. The body is almost wholly without pile, except the thin white beard; the face has sparse black bristles, the dorsum of thorax and scutellum bare, except a row of bristles on each side of the former, and two on the border of the latter; the abdomen wholly bare, black, shining except the interrupted cross-bands on segments 1—6, the femora are bare, the tibiae and tarsi only with black bristles. The fan-like row of bristles in front of the halteres is black, and the species would be sought for under posititious or sudator of Osten Sacken’s synoptical table. Washington Territory.

19. Cyrtopogon dubius n. sp.

2 .—Seutellum flattened, segment on the sides, and the four following with interrupted posterior eross-bands

gray pollinose above: abdomen shining black, first of gray pollen; femora black, tibiae and tarsi dark red; head, except the beard, wholly black pilose, antennae black; wings with narrow brown clouds on the eross-veins. Length 11 mm.

Face thickly whitish pollinose and densely black pilose, beard below white, on the sides and above black. Dorsum of thorax deep blackish brown with dense gray pollinose markings as follows: A slender median stripe obsolete behind ; a large spot in front of the scutellum, slenderly prolonged on its anterior angles to the middle of the dorsum, the humeri, a spot on their inner sides, another large one behind, coneave on its inner border, and a smaller one on the post-alar callosities. Pleurae gray pollinose; the fan-like fringe of hairs in front of the halteres black. Abdomen with white pile on the sides in front; the last two seg- ments wholly shining. Anterior and middle coxae, and all the femora below towards the base with long soft white pile; front tibiae on their inner sides and their metatarsi with golden pubescence; hind tibiae at their tip and the tip of their metatarsi with white pubescence, femora black, tibiae and tarsi dark red,

(4)

14 S. W. WILLISTON, M. D.

the latter more brownish red. Wings hyaline in the basal half, distinctly clouded with brownish on the distal half; the veins from the margin of the second longi- tudinal to the beginning of the posterior basal transverse, narrowly but distinctly clouded with brown, the veins at base of the second submarginal, and the first and second pecuente cells less distinctly clouded.

One specimen, Mt. Hood, Oregon.

This species will fall with -C. profusus in Osten Sacken’s sraioaieal

table, but its relationship is apparently closer to C. posititinus O. 3.

20. Cyrtopogon ? nebulo Osten Sacken, West. Dipt., 309.

Two specimens from Washington Territory I believe belong here; they agree perfectly with the description, except that the style is a trifle shorter than the third joint.

21 2? Cyrtopogon n. sp. (Plate I, fig. 11.)

Resembles nebulo very much, but has the third joint of the antennae and the style very slender, linear, the face less gibbose, deep shining greenish black abdomen, and the body more thickly pilose. The size and wings are the