TWO-WINGED FLIES OF THE GENERA DOLICHOPUSAND HYDROPHORUS COLLECTED IN ALASKA IN 1921,WITH NEW SPECIES OF DOLICHOPUS FROM NORTHAMERICA AND HAWAII.By J. M. Aldrich,Associate Curator, Division of Insects, United States National Museum.The present paper is a report on the material in the genera DoU-chopus and Hydrophorus, of the Dipterous family Dolichopodidae,collected by the writer in Alaska during June and July, 1921 ; it alsocontains additional new species of Dolichopus from Labrador, theUnited States, and Hawaii.Among the localities cited are Camps 327 and 334 ; these are tem-porary names for points on the Government railroad in Alaska, thenumbers indicating the miles from Seward at the south end; theyare both in the south edge of the Yukon Basin, on the Nenana River,in a canyon between mountains. Healy is 358 miles from Seward.Camp 334 has lately been given the permanent name of Carlo, andCamp 327 that of Windy, as sidings on the railroad.Genus DOLICHOPUS Latreille.Dolichopus Latreille, Prgcis des Caracteres G?neriques des Insectes, Paris.1796, p. 159.?LoEW, Smiths, Misc. Colls., No. 171, pp. 18. 323, 1864.?Feey, Acta Societatis pro Fauna et Flora Feunica, vol. 40, No. 5, pp. 1-27,1915.?Becker, Nova Acta, vol. 102, part 2. pp. 126-180, 1921.?VanDuzEE, Cole, and Aldrich, Bulletin 116, U. S. Nat. Mus., 1921, 304 pp.,16 plates.In spite of the fact that 218 species of this remarkable genus aredescribed for North America in Bulletin 116 just cited, my work inAlaska yielded 5 new species and 2 European not previously knownfrom North America ; while 15 previously described North Americanspecies were also collected, of which 8 had never been reported fromAlaska. DOLICHOPUS MANICULA Van Duzee, Cole, and Aldrich.Dolichopus manicula Van Duzee, Cole, and Aldrich, Bull. 116, U. S. Nat.Mus., p. 56.Fourteen specimens, Skagway, Alaska. Originally described fromhigh altitudes in Colorado, New Mexico, and Wyoming.No. 2446?Proceedings U. S. National Museum, Vol. 61, Art. 25 2 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61.DOLICHOPUS ANNULIPES Zetterstcdt.Doliclioims annulipcs Zettekstedt, Insecta Lapponica, 183S, p. 710.Bolichopus stenhammari Zetterstedt, Diptera Scandiuaviae, vol. 2, p. 521,1843.?Van Duzee, Cole, and Aldrich, Bull. 116, U. S. Nat. Mus., p. 59,1921.Two specimens, Healy and Nenana, Alaska. Described from Lap-land and common in northern Europe; has been reported severaltimes from Alaska and Labrador, and one specimen is known fromNew Hampshire (White Mountains). According to Frey, it occursall over Finland, and is especially characteristic of Lapland. I herefollow Becker's monograph in accepting anmdipes as not preoccupiedby Porphijro'ps annulipes of Meigen.DOLICHOPUS XANTHOCNEMUS Loew. . DoKchopus xanthoenemus Loew, Smiths. Misc. Colls., No. 171. p. 31, 1864.?Van Duzee, Cole, and Aldrich, Bull. 116, U. S. Nat. Mus., p. 84, 1921.Nineteen specimens, from Seward, Anchorage, Camp 327, andFairbanks, Alaska. Originally described from Sitka, and sincerecorded several times from Alaska.DOLICHOPUS GROENLANDICUS Zetterstedt.Dolichopns groenlandicus Zetterstedt, Diptera Scandiuaviae, vol. 2, p. 528,1843.?Van Duzee, Cole, and Aldrich, Bull. 116, U. S. Nat. Mus., p. 94,1921.Ninety-four specimens, from Seward, Anchorage, Camps 327 and344, Healy, and P'airbanks, Alaska, June and July. Originally de-scribed from Greenland and later reported from northern Europe.Bulletin 116 records it from Labrador and a specimen from Colorado.While that paper was in preparation I collected a series at TennesseePass, Colorado, altitude a little over 10,000 feet (3.05 kilometers).DOLICHOPUS SOLIDUS Van Duzee. Cole, and Aldrich.Dolichopns solidus Van Duzee, Cole, and Aldrich, Bull. 116, U. S. Nat.Mus., p. 104, 1921.Thirteen specimens, both sexes, Anchorage, Camp 327, and Healy,Alaska, June 15 and July 7. Described from a single male taken onthe Alaska-Yukon boundary near the Arctic Ocean. The front tarsiwere missing in the type. I find that they are of peculiar and dis-tinguishing structure, being flattened horizontally (depressed). Thesecond and third joints are very thin as viewed from above, andthe fourth and fifth are widened (depressed) and fringed laterally.Second and third of equal length, together equaling the first. I ob-tained a male and two females of this species at Tennessee Pass,Colorado. July 9 and 10, 1919. ^m.'^o. XEW SPECIES OF THE GENUS DOLICHOPUS ALDKIOH. 6DOLICHOPUS RUPESTRIS Haliday.DoUchopus rupestris Haliday, Entomologists' Magazine, vol. 1, 1833, p.164.?Van Duzee, Cole, and Aldrich, Bull. 116, U. S. Nat. Mus., p. 112,1921.DoUchopus festinans Zetteestedt, Insecta Lapponica, 1838, p. 708.Fourteen specimens, from Healy. and Camps 327 and 334, Alaska,June 26 to July 13. Described from Great Britain and well knownfrom nortliern Europe. Frey says it is very rare in Southern Fin-land, but one of the comm.oner species of the genus in Lapland and onthe Kola Peninsula.DOLICHOPUS BREVIPENNIS Meigen.DoUchopus hrempennis Meigen, Syst. Bcsclir., vol. 4, p. 89, 1824.- ? Van Duzee,Cole, and Aldkich, Bull. 116, p. 130, 1921.Thirty specimens, from Hurricane, Camp 334, and Healy, Alaska,June 29 to July 3. Originally described from Germany ; common inDenmark (Lundbeck) ; common throughout Finland (Frey). Firstreported from North America by Osten Sacken, on the identificationof Loew ; only a female remains of this lot in the Museum of Com-parative Zoology, Cambridge, Massachusetts, and the species ap-parently has not been collected in North America again until now.DOLICHOPUS RAMIFER Loew.DoUchopus rainifer Loew, Neue Beitriige, No. 8, p. 19, 1861; Smiths.Misc. Colls., No. 171, p. 52. 1864.?Van Duzee, Cole, and Aldrich, Bull,116. U. S. Nat. Mus., p. 147. 1921.Two specimens, Fairbanks, Alaska. July 1. The species occurs asfar south as Indiana and Kansas, and even Los Angeles, California.DOLICHOPUS OBCORDATUS Aldrich.DoUchopus ohcordatus Aldrich, Kansas Univ. Quarterly, p. 14, 1893. ? VanDuzee, Cole, and Aldrich, Bull. 116, U. S. Nat. Mus., p. 173, 1921.Four specimens, Fairbanks and Healy, Alaska, June 26 to July 3.A common species in the western mountains of the United States, nothitherto reported farther north than Nelson. British Columbia.DOLICHOPUS PLUMIPES ScoDoli.Musca plumipes Scopoli, Entomologia carnlolica, 1763, p. 334.DoUchopus plumipes Van Duzee, Cole, and Aldrich, Bull. 116. U. S. Nat.Mus., p. 183, 1921.Sixteen specimens, from Seward. Anchorage, Healy, and Fairbanks,Alaska. Described from Carniola, the species extends widely throughEurope; Frey lists it as common throughout the whole of Finland.In the United States it extends as far south as South Dakota, Maine,and (in mountains) New Mexico. It has been reported from Alaskaseveral times. 4 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61.DOLICHOPUS LONGIMANUS Loew.Dolichopus longimanus Loew, Neue Beitriige. No, 8. p. 14, 1S61 ; Smiths.Misc. Colls., No. 171, p. 3S, 1S61. ? Van Duzee, Cole, and Aldrich, BulL116, U. S. Nat. Miis., p. 195, 1921.Five specimens, Anchorage and Fairbanks, Alaska, June 12 toJuly 2. Described from English River, Canada, and reported fromAlaska by Coquillett in 1900; it occurs in the Canadian zone ofOntario and the eastern part of the United States, and even southto Virginia, but has not been reported from the western UnitedStates. DOLICHOPUS NUDUS Loew.Dolichopus nudus Loew, Smiths. ISIisc. Colls., No. 171, p. 41. 1S64. ? Va.xDuzee, Cole, and Aldrich, Bull. 116, U. S. Nat. Mus., p. 201, 1921.Nineteen specimens, from Hurricane, Camp 327, and Healy,Alaska, July 7 to 13. Not definitely recognized since its description.The single type male, from " Fort Resolution, Hudson's Bay Terri-tory," has been entirely destroyed but the wings; hence the newmaterial is very important. Loew mentions as one character, " Hindtibiae stout but not exactly thickened, upon the first half of the hindside without hairs," This proves to be a decisive character (in themale), the bare spot being on what I would call the inner side, ex-tending to the middle. Loew's description is ample, and the speciesis correctly placed in the analytical table of Bulletin 110, page 15.DOLICHOPUS NIGRICORNIS Meigen.Dolichopus niyriconiis Meigen, Syst. Beschr., vol, 4, p. 82, 1824. ? Becker,Nova Acta, vol. 102, p. 148, 1920.Dolichopus discifer Stannius, Isis. vol. 1, p. 57, 1831. ? Van Duzee. Cole,and ALDracH, Bull. 116, U. S. Nat, Mus., p. 202, 1921.One male, one female, Anchorage, Alaska, June 16. Describedfrom northern Europe; Frey reports it occurring all through Fin-land. Reported from Quebec and Ontario, only a few localitiessouth of the Canadian border (Vermont, New York, Wisconsin) ;has been previously reported from Alaska.DOLICHOPUS BOREUS Van Duzee, Cole, and Aldrich.Dolichopus horeus Van Duzee, Cole, and Aldrich, Bull. 116. U. S. Nat.Mus., p. 204, 192LfDolichopus discimanvs Wahlbeeg, Kongl. Yet. Akad. Forhandl.. vol. 8,p. 301.?Zetterstedt, Dipt. Scand., vol. 12, p. 4626, 1855.Three males, Anchorage, Alaska, June 13 and July 21, Describedfrom Ungava Bay, Labrador. There is little doubt that horeus isa synonym of dischnwius Wahlberg, but I have not seen European ART. :i5. XEW SPECIES OF THE GENUS DOLICHOPUS?ALDRICH. 5material, and the latter species is said to have the front coxae darkat base, which might be specific. Frey includes discimanus under thestrictly arctic species along with mannerheimi; I have quoted himunder that species.DOLICHOPUS AMPHERICUS Melander and Brues.DolicJiopns ampherlciis Melander and Brues, Biological Bulletin, vol. 1, p.146, 1900.?Van Duzee, Cole, and Aldrich, Bull. 116, U. S. Nat. Mus., p.217, 1921.Forty-one specimens, Fairbanks, Alaska, June 30 to July 4. Thespecies has not been identified hitherto except in the type set of twomales and three females, collected in Price Countj^, Wisconsin, nowin the American Museum of Natural History. My specimens agreewith these except in having the hind tibiae somewhat infuscated onthe inner side at tip, and the front coxae provided with some blackhairs on the front side. I am indebted to Dr. Frank E, Lutz, curatorof insects in the American Museum, for the privilege of examiningthese types. There is one excellent male character, present equally inthe types and my specimens, which at once distinguished this speciesfrom all the nine related forms mentioned in Bulletin 116 (p. 219) : On the sides of the first abdominal segment the pleural fold is ratherAvide open above, and in the hollow thus formed is a spot of minutegrayish tomentum or erect, short fuzzy hairs, filling the hollow andextending a little dorsad of it. I have compared all the other ninespecies on this point.DOLICHOPUS MANNERHEIMI Zetterstedt.DoUchopus mannerheimi Zetterstedt, lusi^-ta Lapponica, 1838, p. 707;Diptera Scandinaviae, 1843, vol. 2, p. 500. ? Becker, Nova Acta, vol. 102,p. 163, 1920. ? Frey, Acta Societatis pro Fauna et Flora Feunica, vol. 40,Sep., pp. 4, 27, 1915.Twelve specimens, both sexes, collected at Camps 327 and 334 andat Healy, Alaska, June 26 to July 13.Not heretofore reported from North America. Originally describedfrom Lapland. Frey includes it among a list of 20 species of Dolich-opodidae of which he says (p. 4) : " The oldest postglacial Dolichopo-did species are those * * * which now occur only in Lapland andthe Kola Peninsula, and here j^rincipally within the purely arcticfield and tundi-a regions. The limit of forest is not decisive for them,as they may occur in the northern coniferous zone. * * * Theirsouthern limit is approximately the Arctic Circle." (Translation.)No Euroj^ean specimens have been compared, but the charactersare striking, and Zetterstedt's elegant description seems unmistakable.The species is here redescribed for the benefit of American workers.In Bulletin 116 it runs to laticornis in Group A on page 9, from which 6 PEOCEEDIXGS OF THE NATIONAL MUSEUM. vol. 61.it is separable by many characters, among them the infiiscation in thewing tip.Male.?Front green. Face pale yellow, rather narrow. Palpiblack. Antennae entirely black, rather short. Orbital cilia entirelyblack.Mesonotum and scutellimi rather obscure green, with coppery reflec-tions and rather distinct changeable stripes. Pleurae blackish green,but little shining. Cilia of calypters white. Halteres yellow. Abdo-men rather long, dark green. Hj^popygium large, the lamellae white,rather square across the apical end where they are broadly borderedwith black, deeply notched and provided with the usual curved bris-tles ; the upper border is fringed with erect hairs which become largertoward the base.Coxae black, the front ones somewhat silvery on the anterior side,with small dark hairs. Femora black except the extreme knees;front tibiae yellow, the middle tibiae yellow but on the outer sidedistinctly white and without the usual small black hairs. The tipof the middle tibia distinctly infuscated, hind tibia yellow, slightlydarkened at base, with the apical fifth black. Front tarsi plain, thefirst joint yellow except at extreme tip, the remainder black; middletarsus with the first joint brown, its apical fourth white, on the outerside snow-white and bare, the extreme tip and all the following jointsdeep black; hind tarsi deep black, the first joint as long as all thefollowing and bearing about 14 bristles in several erect rows, one ofwhich is on the under side; the middle femora have a row of shortwhite cilia beginning about the middle, the hind femora with a rowof long white cilia from the middle.Wings elongate, rather narrow, with a uniform gray tinge and adistinct apical dark spot, which begins at about the tip of the secondvein and extends almost to the hind margin, filling out the apexexcept a narrow border beginning behind the tip of the fourth vein ; hind cross vein bearing a slight cloud ; anal angle small, costa with adistinct thickening at the end of the first vein.Female.?Face a little wider than the male ; front coxae with manymore black hairs. Cilia of calypters yellow, middle tibiae not quiteso wide as in the male, the middle basitarsus brown, its extreme tipblack. Wing broader than in the male, the apical spot present, butless distinctly defined; hind cross vein very distinctly infuscated.Length of male 6.2 mm. ; of female 5.8 mm.The only species known in North America which is at all similarto this one is aiinulipes Zetter.stedt {stenhammari of authors), Avhichalso has black legs with the middle tibiae and tarsi ornamented withwhite. It, however, has a different color pattern and is easily sepa-rable by having black cilia on the calypters. .^RT. iJ5. NEW SPECIES OF THE GENUS DOLICHOPUS?ALDPJCH. 7DOLICHOPUS LONGICORNIS Stannius.Dolichopus longicornis Stannius, Isis, vol. 1, p. 53, 1831 (published 1838). ? Bkcker, Nova Acta, vol. 102, p. 170, 1921.Not previously reported from North America.Thirty-five specimens of both sexes, taken at Fairbanks, Alaska,from June 29 to July 3 ; compared with European specimens in mycollection, determined by Doctor Kertesz. Originally describedfrom northern Europe; Frey mentions it as widespread but notabundant in Finland. Redescribed for the convenience of Americanstudents. In the analytical tables of Bulletin 116, the male runs tocouplet 2 of Group F, on page 14, where it forms a third alternative"Antennae black above, yellow below including a large part of theelongate third joint."Male.?Front green. Face shining yellow, changing to palerbelow. Palpi yellow. Antennae very much elongated, the firstjoint slender, the third very long with a slender point, the aristaattached about at the middle. Antennae black, broadly yellow belowincluding the third joint almost to its middle; the arista slightlythickened be^^ond the middle but .slender at apex. Orbital cilia whiteexcept a few above.Mesonotum and scutellum rather bright green. Pleurae green,overlaid with some gray dust. Calypters with white cilia. Halteresyellow. Abdomen subshining, green. Hypopygium black, green ntbase, the lamellae white, oval, with a sharply defined black borderabove, becoming wider apically, the hairs along the upper borderlonger and more erect than usual ; the apex has the usual incisionsand crooked bristles.Front coxae yellow with pale hairs on the anterior side; middlecoxae black except at tip, hind coxae yellow with a black spot on theouter side, extending down to the bristle. Femora and tibiaeyellow, the hind tibiae infuscated at the tip where they are slightlyswollen and have on the hind side, just before the apex, a very dis-tinct rounded depression; the color of the front and middle tibiaeis more white than usual; femora not ciliated. The middle tarsiplain, brown from the tip of the first joint; hind tarsi entirely blackwith only about three bristles.Wings with a grayish tinge, rather broad, with the anal anglelittle developed ; a very pronounced thickening of the costa at the tipof the first vein.Female.?Face broader and grayish yellow. Antennae shorterthan in the male, still noticeably elongated, with a very sharp point ; the yellow color on the under side reaches almost to the tip and isvery distinct on the third joint. The cilia of the calypters may bein part black. Hind tibiae scarcely at all infuscated, especially onthe outer side.Length of male 3.1 mm. ; of female 3.8 mm. 8 PROCEEDINGS OF THE NATION^AL MUSEUM. vol. Gl.DOLICHOPUS FORTIS, new species.Male.?Front bronze green. Face brownish 3^ellow, glistening.Palpi black. Antennae entirely black, of ordinary size. Orbitalcilia entirely black.Mesonotum and scutelliim dark bronze green, a little dusted, cop-pery along the suture. Pleurae blackish-green, moderately dusted.Cilia of the calypters black. Halteres yellow. x\bdomen ratherelongated, blackish-green with bronze reflections. Hypopygiumblack, of moderate size, the lamellae whitish, oval, with a broadblack margin apically and below, the usual incisions and crookedbristles at the apex.Legs black, the knees vei-y narrowly yellow; all the tarsi plain,the front ones about one-fourth longer than their tibiae; hind fe-mora with long cilia below, most of which appear pale in favorablelights.Wings decidedly infuscated throughout, the hind cross-vein andthe curvature of the fourth vein slightly more so; costa with a shortenlargement at the tip of the first vein; outline of the wing of theordinary form.Length 5.4 mm.Described from one male taken by the writer at Healy, Alaska,June 23, 1921.r?/;?e.?Male, Cat. No. 25188, U.S.N.M.Runs to paluster on page 10 in the analytical table of Bulletin116; but is a more elongated species, much less green in color, withlong instead of rounded wings.DOLICHOPUS PENSUS, new species.Male.?Front green, not very shining. Face silvery, of moderatewidth and rather long. Palpi yellow. Antennae black; very muchelongated, especially the third joint, which has a long slender pointextending much beyond the insertion of the arista; the first joint isdistinctly yellow below at the apex. Orbital cilia white except theupper ones. The head is not so wide in proportion to its height as inmost species.Mesonotum and scutellum green, not very bright. Pleurae dullgreen. Calypters with white cilia. Halteres yellow. Abdomenrather bright green with the usual thin pruinosity on the sides.Hypopygium rather large, the lamellae white with the usual blackborder and witli the apex notched and bristly.Front coxae yellow; middle and hind coxae black except tips.Front femora yellow with rather distinct but poorly defined darkshading along the middle; middle femora yellow still with faint in-dications of infuscation: the hind femora vellow on the basal half. AUT. 25. XEV\^ SPECIES OF THE GENUS DOLICHOPUS ALDBICH. 9gradually becoming black at the apex ; the extreme tip, however, isyellow. Front and middle tibiae pale yellow ; the hind tibiae blackwith a brown streak on the posterior except near tip ; they are consid-erably longer than their femora and their tarsi are strikingly elon-gated and enlarged, and deep black in color; the second joint of thahind tarsus seems especially enlarged and noticeably flattened; thefollowing joints of similar appearance but decreasing in size ; frontand middle tarsi plain, infuscated from the tip of the first joint.Wings hyaline with a perceptible brown tinge on the anterior halfexcept at base ; costa not thickened ; anal angle very much reduced./^emaZe.?Face a little wider than in the male, rather gray in color.Antennae longer than usual in the female, the third joint with anuncommonly sharp tip but very much shorter than in the male. Ciliaof the calypters sometimes in part black. Femora colored as in themale ; the hind tibiae, however, yellow except on the apical fourth ; they are longer than the femora as in the male and the hind tarsi areconsiderably elongated and entirely black but the joints are not en-larged or flattened. The wing has a distinct brownish tinge which isnot confined to the anterior half.Length 3.1 mm.Described from 12 males and 13 females collected at Fairbanks,Alaska, on June 30, 1921, by the writer.Type.?Male, Cat. No. 25189, U.S.N.M.The striking enlargement and black coloration of the hind legssuggested the name, the idea being than these characters are probablydisplayed while hovering in the air, the legs hanging down.In the tables of Bulletin 116 I would put this in Group F, in spiteof some infuscation of the front femora ; it would then run to acutus,page 15, but the latter has no infuscation of any of the femora, etc.DOLICHOPUS SIMPLICIPES. new species.Male.?Front rather dull green. Face narrow, silvery, with aslight yellowish tinge. Palpi yellow. Antennae black,*^ the firstjoint faintly yellowish below on the inner side, the third joint ratherbroad, but not elongated. Orbital cilia white except a few above.Mesonotum and scutellum bronze-green, not very shining. Pleuraegreenish-black, with a rather thick gray dust. Calypters with blackcilia. Halteres yellow. Abdomen shining green, not very bright,a thin whitish pruinosity along the sides. Hypopygium black, ofmoderate size, the lamellae oval, white, with a narrow margin aboveand a broader one at apex, where there are the usual notches andcurved bristles.Front coxae yellow, with a small indistinct dark spot at base onthe outer side; the front side with pale hairs; middle and hind coxaeblack except at tip. Femora yellow; the hind ones slightly infus- 10 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61.cnted at tip, not ciliated, but with unusually long black hairs on outerlower part beyond midde, with a single long preapical bristle. Frontand middle tibiae yellow, the hind ones infuscated on about the apicalfourth but not much enlarged; front tibia at apex below with along slender bristle two-thirds as long as the basitarsus. All the tarsiplain, the front and middle ones infuscated from the tip of the firstjoint; hind ones entirely black.AVings hyaline, rather narrow, the angle much reduced ; the fourthvein with only a slight bend, ending much before the apex of the wing.Costa with a large and long thickening at the junction of the firstvein.Female.?Face considerably wider than in the male, almost white.Front coaxae with black hairs on the anterior surface. Hind femorawith faint infuscation covering about the apical fourth.Length 3.2 mm.Described from 3 males and 2 females. All collected by the writerat Camp 327, Alaska, July 12, 1921.Type.?M2lQ, Cat. No. 25190, U.S.N.M.ySimpUcipes runs in the tables of Bulletin 116 to couplet 10, page17. It differs from discolor in having the costa thickened, and fromgenuaJAs in not having the lamella produced in a sharp point at apex.DOLICHOPUS CRASSICORNIS, new species.Male.?Front bright green. Face light golden yellow, rathernarrow below\ Palpi yellow. Antennae wholly black, quite large,the third joint considerabl}' elongated, about twice as long as wide;the arista inserted near the tip. Orbital cilia pale yellow excepta few above.Mesonotum bright green with a brown mark each side. Scutellumgreen. Pleurae green, subshining. Cilia of the calypters black.Halteres yellow. Abdomen bright green, at incisures narrowlyblackish. Hypopygium black. Lamellae white, oval or somewhatrectangular, with a black border above which is wider apically,where there are the usual incisions and curved bristles.Coxae black, the front ones slightly yellow toward the apex, es-pecially on the front side. Femora yellow, front ones faintly tingedwith brown below, the hind ones without cilia, and with a slightbut distinct infuscation at the tip above. Tibiae yellow, the hindones deep black on the apical third or more, slightly enlargedapically and bearing on the hind side just before the apex a verystriking, rounded depression; the flexor side of the hind tibiaeclosely beset with small black suberect hairs. Hind tarsi entirelyblack; front and middle tarsi plain, black from tip of the first joint.The front tibia has at apex a fine curved hair-like bristle which isquite short, less than half the length of the basitarsus. ART. 25. XEW SPECIES OF THE GENUS DOLICHOPUS .\LDEICH. 11Wings hyaline, of ordinary shape; the anal angle not very promi-nent. The costa with a long tapering enlargement from the junc-tion of the first vein.Female.?Face yellow, twice as wide as the male, dull white incolor. Third antennal joint of ordinary form. The front femorawith quite distinct traces of brown above and below; the middlefemora with faint brown tinge below ; hind femora with the tipdeeply infuscated. Costa not enlarged. Otherwise as in male.Length 3 mm.Described from 6 males and 1 female, all from Healy, Alaska,except 2 males which are from Camp 327, Alaska. Collected bythe writer.Type.?M2lQ, Cat. No. 25191, U.S.N.M., from Healy, Alaska.Runs to sincerus in the table of Bulletin 116, page 17, but hasmuch longer antennae and a strong thickening of the costa.DOLICHOPUS INFLATUS, new species.Male.?Front green, iace light golden yellow. Palpi yellow.Antennae of ordinary size, the first joint wholly yellow, the othersblack. Orbital cilia white except a few above.Mesonotum and scutellum bluish green, moderately bright with acoppery stripe at the suture. Pleurae green, moderately dusted withgray. Cilia of the calypters black, rather abundant. Halteres yel-low. Abdomen bright green, rather coppery on the posterior partof each segment, almost wholly shining. Plypopygium rather small,black, the lamellae oval, white, with a narrow black margin, the tipincised and furnished with the usual long bristles.Wings slightly brownish, more so toward the costa, rather narrowin shape, the hind border distinctly emarginate between the fifthand sixth vein ; anal angle prominent ; costa with an elongated swell-ing at the junction of the first vein.Legs yellow, the middle and hind coxae black except at tip ; hindfemora not ciliated; all the tarsi plain, pale at base; the middletibiae with a smooth, white inflated portion on the outer side of the ?apical fourth. The front coxae have rather conspicuous black hairson the anterior side.Length 4.8 mm.Described from one male taken at Anchorage, Alaska, July 20,1921, by the writer.T^yy^e.?Male, Cat. No. 25192, U.S.N.M.The structure of the middle tibia is about the same as in fulvipes.,but the latter has the antennae elongated and almost entirely yellow,with several other differences. The species runs to fulvipes in thetable in Bulletin 116, page 26. 12 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 61.DOLICHOPUS DELICATUS, new species.MaU.?Front bright green. Face rather wide, grayish yellow.Palpi dark yellow and quite prominent. Antennae slightly elon-gated, black, the first joint broadly yellow, the third sharply pointed,but not remarkably elongated. Orbital cilia yellowish white excepta few above.Mesonotum and scutellum coppery green in color. Pleurae black-ish green, dusted with gray. Calypters with black cilia. Abdomenbright green with coppery reflections. Hypopygium rather smalland rounded, black; the lamellae rather deep yellow, small, oval,with brownish border and at the apex some incisions and moderatelylong bristles.Legs yellow, the middle and hind coxae black, the front coxae in-fuscated on the outer side near the base; hind femora not ciliated,hind tibiae slightly infuscated at apex and tarsi wholly black. Fronttarsi with the first four joints yellow, the second, third, and fourthof almost equal length, the fifth joint black, very slightly compressed,about three-fourths as long as the fourth joint; middle tarsi infus-cated from the tip of the first joint.Wings rather brownish, of about normal shape, the costa hardlythickened at the junction of the first vein.Female.?Front still wider than in the male, quite gray, the an-tennae a little shorter. The anterior tarsi are rather dark yellow tothe last joint which is black but not at all compressed. The thirdand fourth joints are each a little shorter than the fifth.Length 5 mm.Described from 4 males and 3 females taken at L^^ngava Bay andFort Chino, Labrador, collected by L. M. Turner.T'y^e.?Male, Cat. No. 25193, U.S.N.M., from Ungava Bay.Delicatus runs to horeus, page 22, in the table of Bulletin 116,and greatly resembles that species; the male fore tarsi are on thesame plan yet quite distinct. The fourth joint in horeus is very thinand elongated, and the fifth is about one-third as long but very dis-tinctly compressed though small. In delicatus the fourth joint isless elongate and thin; the fifth is one-half as long, and so slightlycompressed that it might almost be called plain. The lamellae indelicatus are smaller and more rounded than in boreus, and thecosta is not thickened.DOLICHOPUS ELEGANS. new species.Male.?Front green. Face pale yellow, rather narrow below.Palpi dark brown. Antennae of the ordinary size, entirely black.Orbital cilia white except a few of the upper ones.Mesonotum and scutellum rather shining green. Pleurae greenwith a little gray dust. Cilia of the calypters black. Halteres ABT. 25. XEW SPECIES OF THE GENUS DOLICHOPUS ALDEICH. 13yellow. Abdomen green with bronze reflections and slight prui-nosity. Hypopygium large, black, the lamellae oval, whitish, withblack border which is rather wide above as well as apically, the apexhas a few small incisions and longer bristles.Legs yellow, middle and hind coxae black, front coxae blackishat base for about one-third the length and on the outer side for two-thirds; hind femora not ciliated, decidedly infuscated at tip; hindtibiae black on the apical fifth and their tarsi entirely black; frontand middle tarsi infuscated from the tip of the first joint, the frontones about one-third longer than their tibiae, the last two joints dis-tinctly flattened but w^ithout lateral fringes of any size; whenviewed from above the second and third joints appear very narrowemphasizing the breadth of the last two. They arc all of a grad-ually decreasing length.Wings slightly infuscated or sul)hyaline, of ordinary shape; thecosta wnth a rather short enlargement at the tip of the first vein.Female.?Face dull gray, wider than in the male; front coxaealmost entirely black; hind femora rather more broadly infuscatedat tip. Wings distinctly wider than in the male.Length 3.8 mm.Described from 4 males and 1 female taken by the writer atTennessee Pass, Colorado, altitude 10,240 feet (3.12 kilometers).July 10. 1019.ry/?^.?Male. Cat. No. 25194, U.S.N.M.DOLICHOPUS LONGUS. new species.i1/rt/:EV.' species of IHE genus DOLICHOPUS ALDRICn. 15rt/;;^.?Male, Cat. No. 25410, U.S.N.M.Runs to virga on page 17 of the analytical table of Bulletin IIG,but diflPers in the male in having the front steel blue, the anal angleof the wing conspicuously reduced in size and the third and fourthjoints of the front tarsi not broadly fi-inged so as to have the appear-ance of a tassel. DOLICHOPUS TOWNSEXDI, new species.Male.?Front green, face pale yellow, quite narrow below ; palpiyellow ; antennae of moderate size, the first two joints entirely yellow,third entirely black, not at all elongated; orbital cilia pale, aboutsix of the upper ones black ; thorax and abdomen bronze green witha considerable whitish dust, which in certain lights partly obscuresthe ground color. Pleurae of the same color but a little more dusted ; calyptcrs with black cilia. Hypopygium long and stout with excep-tionally large lamellae, which are widest near the apex, rather trun-cate, white except a narrow apical and still narrower upper borderthe apical margin begins below with long processes bearing cilia,tliese become gradually shorter at the upper corner and bear a rather'iniform row of cilia. T^egs yellow; all the tarsi blackened from thetip of the first joint, the second joint, however, more or less pale atbase; fore tarsi plain, not much longer than the tibiae; front coxaewithout dark hairs except near the tip ; middle and hind coxae brownas far as the bristle; hind femora without cilia, middle and hindwith only one preapical bristle, hind tibiae not at all enlarged, on thehind side free from hairs between the two rows of bristles where theyseem to be whiter on account of the absence of hairs. "Wings almosthyaline, widest a little beyond the large crossvein, at which pointthe costa begins to bend backward: fourth vein ending rather farbefore the apex, almost parallel with the third; a distinct notch inthe hind margin at the tip of the fifth vein ; anal angle small ; costanot thickened at the junction of the first vein.Length of male, 5.4 mm.Described from 1 male, on rocks by stream, Rio Ruidoso. "WhiteMountains. Xew Mexico, about 6.500 feet altitude (1.98 kilometers),July 30, collected by C. H. T. Townsend.ry7?e.?Male. Cat. No. 25237, U.S.N.M.Runs to terminalis in couplet 58 on page 26, but differs in the verylarge wide lamellae, in having the front tarsi darkened from the firstjoint instead of only the last joint, and in some other minor char-acters. DOLICHOPUS EXSUL, new species.Male.?Front green, face silvery white, rather narrow below.Palpi yellow. Orbital cilia white except a few of the upper ones.Antennae slioii:. broadly reddish below including the third joint. 16 PROCEEDINGS OF THE NATIONAL MUSEUM. vnr. 81.The first joint narrowly blackish on the upper edge, the third mostlybrown.Mesonotum shining green with a coppery stripe on each side alongthe suture. Scutellum shining green. Pleurae blackish green, cov-ered with a thin gray dust. Cilia of the calypters black. Halteresyellow. Abdomen shining green, but less bright than the thorax.I'osteriorly it is compressed. Hypopygium large, blackish green.Lamellae nearly circular, white with a very narrow dark border.The front edge deeply incised from half a dozen long processes withbristles at the tip.Legs yellow. The middle and hind coxae blackish except at tip.The hind tibiae blackened from about the middle to end. Tarsientirely black. Front and middle tarsi gradually infuscated towardthe apex. Front coxae with black hairs on the anterior surface.Wings hyaline, rather narrow in shape, the anal angle not veryprominent. The fourth longitudinal vein sharply bent beyond thecross vein with a stump of a vein at one or both of the bends. Costawith an elongated swelling not very large at the junction of the firstvein.Female.?Face about half wider than in the male. Hind tibiae in-fuscated on the apical fourth, otherwise about as in the male.Length 4 mm.Described from G males and 5 females collected at Tantalus andWaialua, Oahu, and at Olaa, Hawaii, 2,500 feet (0.76 kilometer), allin the Hawaiian Islands, by W. H. Ashmead.Type.?M^\Q, Cat. No. 25197, U.S.N.M., from Tantalus.This is the only true DoUchopus known to me to occur in a tropi-cal climate. The species is not known from North America ; it wouldrun to abrasus on page 20 in the tables of Bulletin 116, but is readilyseparable by its short, broad lamellae. It may have been introducedfrom Japan, but tlie species of that region are too imperfectlyknoAvn as yet to settle that point.Genus HYDROPHORUS Fallen.Jlydroplionis Fallen, Diptera Sueciae, Dolichopotles, 1823, p. 2. ? Loew,Smiths. Misc. Colls., No. 171, 1864, p. 211.?Aijjkich, Psyche, vol. 18,pp. 45-73, 1 pi., 1911.Six species of this genus were collected in Alaska in my expeditionof June and July, 1921 ; one was undescribed, none European, andall but two occur in the United States.HYDROPHORUS ALTIVAGUS Aldrich.Hydrophorus oliivutjVH Aldrich, Psyche, vol. 18, p. 67. 1911.Ten specimens, Anchorage and Fairbanks, Alaska. Described fromColorado, and I afterwards collected it at Moscow, Idaho. ABT. i!5. NEW SPECIES OF THE GENUS DOLICHOPUS ALDRICH. 17HYDROPHORUS BREVISETA Thonnon.Medeterus breiHseta Thomson, Fregat. Eugenies Resa, 1868, p. 150.Hyclrophorus 'brcinseta Aldrich, Psyche, vol. 18, p. 58, tigs.. 1911.Four specimens, Seward and Skagway, Alaska. Described fromCalifornia, presumably San Francisco; since reported from the PugetSound region. HYDROPHORUS INNOTATUS Loew.Hydrophorus innotutus Lokw, Smiths. Misc. Colls., No. 171, p. 212, 1864. ? Aldbich, Psyche, vol. 18, p. 66, 1911.?Malioch, Rept. Caiuid. ArcticExped., vol. 3, p. 50c, 1920.Eight specimens, Skagway, Alaska, June 4, and Seward, Alaska,July 24. Originally described from Sitka, and since reported fromArctic Canada, Oregon, and WashingtonHYDROPHORUS GRATIOSUS Aldrich.Hydrophorus yratiosas Ar.uiucii, Psyche, vol. 18, p. 40; Entom. News, vol.24, pp. 215, 217, 219.Two specimens, Anchorage, Alaska, July 21, and Seward, Alaska,July 24. Described from Idaho, Washington, and California, andsince reported from Utah and Nevada.HYDROPHORUS SIGNIFERUS Coquillett.Hydrophorus siynifenia C'oquillktt, Fur Seals and Fur Seal Islands, vol. 4,p. 344, 1899.?Malloch, Rept. Canad. Arctic Exped.. vol. 8, p. 50c.One female, Healy, Alaska, June 26. Described from BeringIsland, and reported with additional description by Malloch fromTeller. Alaska. The National Museum has eiglit specimens collectedby J. M. Jessup in 1912 on the x\laska-yukon boundary at latitude69^ 20'. HYDROPHORUS AQUATILIS, new species.Female.?Front with gray pollen, along the orbits thinner so asto show a little of the green color beneath ; face entirely gray poUi-nose: cheek below the eye rounded and narrow; beard yellowish;antennae black, of ordinary size; occiput with a single pair ofbristles. Mesonotum yellowish gray pollinose, with brownish re-flections which are brighter above the wings; pleurae of the samecolor : propleura with yellow hairs and one yellow bristle ; calypterswith yellowish cilia. Halteres decidedly black, the stem yellow ex-cept at base. Abdomen greenish, coppery, with a thin gray pollen.Legs black, the femora with greenish reflections ; front coxae coveredwith yellowish pollen, with rather long yellow hair in front andwithout any black bristles even at the tip. Front femora moderatelythickened at base, with a row of seven or eight spines hardly reach-intr the middle, and some scattered much shorter spines extending 18 PROCEEDINGS OF THE NATIONAL MUSEUM. voi,. 61.along the inner side of this row and somewhat beyond. The fronttibia almost straight, on the extensor side with a row of short evenbristles; on the flexor side a denser row of more erect and shorterlittle spines, terminating in one which is a little longer; middle andhind femora very slender. Wings long and narrow, uniformlytinged with brown, without any distinct spots.Length, 3.8 mm.Two females, Fairbanks and Nenana, Alaska.Type.?Y2mi\\Q, Cat. No. 25409, U.S.N.M., from Fairbanks.