June 189o. PSYCHE. 355

the antepenultimate segment; appen-dages (9) short (3 mill.) foliaceous,broad, obtuse, wings hyaline, costa yel-low pterostigma elongated, fuscousmembranule blackish gray ;the subnodalsector sometimes not bifurcated; 13-16and 8 antecubitals o- 12 postcubitals4-5 areoles beneath the pterostigma.Length 5-6o ram. alar expanse 74-86mm. pterostigma 4 turn.Hap. Labrador Fort Resolution

and Saskatchewan, Brit. _Amer. ;one$ White Mountains, N. H.This species is very much like A.

3orealis from Europe; I am not ableto separate the males, except that the Tspot on the front has a larger and morerounded head in A. selStentrioea[is;the appendages of the female are more

widely separated at the base, less broadand somewhat incurved in the Europeanspecies. I consider the two species aslocal wtrieties, but owing to the obviousdifference in the appendages of the fe-males it seems more prudent to keepthem separate for the present. I havecompared 15 specimens of A. septen-trionalis and 9 specimens of A. 3orealisfrom Lapland, Sweden, Silesia andSwitzerland. Both are arctic species.Many years ago I saw a specimen fromthe Wilui River, Siberia, but this speci-men is not at hand and as at that timeI believed A. silchensis to be the samespecies I am unable now to say if theSiberian specimen belongs to A. borea-lis.

DESCRIPTIONS OF SOME NEW NORTH AMERICAN

DOLICHOPODIDAE.

BY VrILL1AM M. WHEEL:EII, MILWAUK:EE WIS.

Continued from . 343.)GYMNOPTER:NUS POENITENS, n. sp.Length 2.75 ram. length of wing 2.75 ram.Dark metallic green. Face moderately

broad, covered with hoary dust. Antennaeblack throughout, third joint large and ofthe usual shape, somewhat pointed andcovered with conspicuous whitish pubes-cence; pubescence of the arista, which isinserted in the middle of the dorsal con-tour of the third joint, appressed andperceptible only with difficulty. Frontrather dull metallic green; cilia of the in-

ferior orbit white. Thoracic dorsum shin-ing blackish green, posteriorly with a bril-liant golden reflection, apparently withoutany traces of dust. Scutellum blackishgreen with a golden reflection, bearing afew black hairs besides the usual setae.Pleurae anteriorly metallic greenish black,posteriorly black, overlaid with hoary dust.The yellow tegulae have black cilia. Abdo-men blackish green, lacking the goldenreflection of the thorax and scutellum;venter black, dusted with white; hypo-

[June ,89

pygium black; lamellae large, elongateoval, brownish yellow, posterior edgesblack, irregularly crenulated and fringedwith weak black bristles; the numeroussmaller and moe concealed appendagesof the hypopygium yellow. Coxae andlegs black throughout; femora with a faintmetallic green reflection. Fore legs smooth,tarsi equaling the tibiae in length; medianfemur with a preapical bristle, median tibiawith two setae on its posterior face, sepa-rated by a distance equal to 1/2 the length ofthe tibia; hind femur with a preapical bris-tle, hind tibia with tour or five spines alongits posterior face. Halteres pale dull yellow.Wings smoky gray, becoming almost blackalong the costal margin; veins black, thethird and fourth longitudinal veins gentlyconverging and, for a Gymnoltemus veryclosly approximated at their tips. Analangle very obtuse, giving the wing a lance-olate outline.

HABITAT: Milwaukee Co., Wis.Gymopters poenitens is to be ad-

mitted to the group comprising Loew’sG. scotias, G. bar3atulus, and G.tristis, all of which differ from theother described North 2kmerican spe-cies of the genus in having the pre-vailing color of the feet black. (5.

oenitens differs from G. scotias inhaving the cilia of the inferior orbitwhite, the feet entirely black, the hypo-pygial lamellae large and in great partyellow; from G. 3ar3atulus and G.tristis, G. oenitens differs in themore hairy third antennal joint andits completely black legs. Both ofLoew’s species also have the cilia ofthe inferior orbit black. The course ofthe third and fourth longitudinal veinsis very different in G. poenilens from

what it is G. tristis, in wlich species,according to Loew, there is only aslight convergency, though he men-tions in a note a male with a con-siderably stronger convergency of thethird and fourth longitudinal veins."He considers this specimen to bemerely a striking variety of G. tris-tis.

CHRYSOTUS WISCONSINENSIS, n. sp. g’. .Length 2.5-2.75 mm. length of wing 2.-

2.25 ram.Splendid metallic green. Antennae en-

tirely black; third joint small, rounded,rather hairy; eyes completely meeting onthe face in the male; in the female the facebroad, covered with silvery white dust, andcrossed by a marked tranverse ridge a littleabove the oral margin. Palpi black, smalland somewhat concealed in the male; con-siderably larger and covered with silverywhite dust in the female. Front broad inboth sexes, triangular, widening to,yardsthe occiput, metallic green, inclining toviolet, somewhat dimmed by a layer of" finedust; cilia of" the superior orbit black,those of the inferior orbit ghstening white.Thoracic dorsum and scutellum brightgolden green, overlaidvith a thin layer ofyellowish white dust, which is thickest onthe humeri: pleurae metallic green, ratherthickly coveret with white dust, cilia of thetegulae white. Abdomen bright goldengreen, rather thickly covered with blackhairs; terminal segments more blackish;hypopygium of the male quite large, barelyconcealed, appendages glistening, black.Legs quite hairy; fore coxae yellow, theirextreme bases metallic green in front; theirtips with a tuft of black hairs. Anteriortarsi blackened from the tip of the secondjoint; hind legs somewhat robust, tarsiequaling the tibiae in length, black andquite hairy, only the base of the metatarsal

June $9o.] 357

joint yellow; apical third of the tibiablackened. The mature male has a ratherbroad metallic black band around the apex ofthe hind femur, leaving only the extremetip yellow. In the female and immaturemale this band is represented by a more orless distinct black or fuscous spot. In themale there are several (about six) robustspines on the posterior face of the hind tibiaand three less conspicuous and obliquelyinserted setae at the tip of each of the fourposterior femora. Halteres bright yellow."Vings grayish hyaline with black veins;the posterior cross-vein is some distance infl’ont of the centre of the wing.

HABITAT; Milwaukee Co., Wis.The coloring as described above is

constant in five males and three femalesin nay collection. The species is alliedto Chrysotus paNipes, Loew. It dif-fers in having the eyes completely con-tiguous in the male and not separatedby a linear white fice, and in havingthe hind legs very diflirently colored.In Loew’s species the hind legs are yel-low; "even the tarsi are only slightlydusky towards the tip." Loew’sspecimens could hardly have beenimmature individuals of C. wis-consinersis as I have three immaturespecimens which differ flotn the matureones only in having the shining blacksubapical band of the hind femorarepresented by a fainter spot.

CHRYSOTUS PRATINCOLA, n. sp. ’Length 2.25 mm.; length of wing2 ram.Palpi brown; antennae black, third joint

small, rounded, with apical arista. Facebroad for a male Ckrysolus, opaque black, asis also the front in my specimen. Cilia ofthe superior orbit black, those of the in-

ferior orbit sparse, whitish. Thoracic dot-sum, scutellum and abdomen metallic green,rendered almost opaque by a thick layer ofbrown dust: pleurae opaque, black. Ciliaof the tegulae pale yellowish. The sparsehairs covering the abdomen dirty white. Hy-popygium black, concealed; venter of a palerand more bluish metallic green than the terga.Coxae opaque black, tipped with yellow andeach provided with a tuff of glistening whitehairs on the anterior face; these hairs arelongest on the fore coxae. Legs not veryhairy; femora black with metallic greenlustre, especially on the hind pair; theirapices and extreme bases yellow; tibiaeyellow covered with short weak black hairs;tarsi yellow, blackened on all the feetfrom the tip of the first joint; hind tarsiscarcely as long as the hind tibiae. Hal-teres honey yellow. Wings hyaline, withvery faint grayish tinge; veins black; theblack costa is moderately incrassated fromits juncture with the first longitudinalvein to the tip of the wing; towards whichit gradually diminishes in thickness; pos-terior cross-vein in front of the middleof the wing.

HABITAT Saline Co., Nebraska.The moderately thickened costa, the

broad face and the coloring of thefemora place this species near Loew’sChrysotus sucoslalus. From thisspecies C. pratincola may be dis-tinguished by its very thick coveringof brown dust and the pale hairs cover-ing the abdomen. Perhaps a greaternumber of specimens than eitherLoew or I have had the opportunity toexamine, may show the two species tobe identical.

CHRYSOTUS CHORICUS, n. sp. ’Length 2. ram; lngh of wng .75 ram.Bright metallic green. Palpi pale, fus-

58 /DSYC/-]Z". [June 89o.

cescent towards their bases. Face verynarrow, the eyes almost meeting, coveredwith whitish dust. Antennae deep velvetyblack, first joint somewhat slender, thirdjoint broad and hairy, ending anteriorly in ashort and blunt point, above which is in-serted the arista. Front metallic green, itsedges at first parallel, then diverging pos-teriorly; cilia of the inferior orbit pale.Thoracic dorsum and scutellum brightmetallic green, with scarcely any dust;pleurae greenish black, dusted with white.Tegulae with glistening white cilia. Ab-domen short, cylindrical, and like the tho-racic dorsum, bright metallic green, ratherthickly covered with stiff black hairs;its terminal segments more blackish; ap-pendages of the hypopygium pale, hairy.Coxae black, with yellow tips, the anteriorpairs with tufts of rather long white hairs.Legs very hairy; femora shining metallicgreen, tips and extreme bases pale yellow;fore tibiae pale yellow; median tibiae grow-ing blackish towards their apices. Anteriortarsi black excepting the base of the meta-tarsal joint, which is yellow; pulvilli notperceptibly enlarged. Hind legs more ro-bust than the anterior, tibiae and tarsishining, blue-black; each femur with a rowof black hairs, running from the base to theapex on the outer edge and increasing inlength distally; hind tibiae and tarsi thicklyclothed with rigid black hairs; the formerwith five spines on the posterior face, thelatter robust, not perceptibly tapering tillthe fourth joint. Peduncles of halteresbrown, capitula honey yellow; their tipssometimes blackened, more often onlyslightly infuscated. Wings grayish hyalinewith black veins.

H:BT:T Milwaukee Co., Wis.This species is related to C.

uus, Loew, and somewhat more closelyto C. adonis of the same author. It

differs from both in having the cilia otthe tegulae white, fl’om C. olfguus,also in the hirsuteness of the hindtibia and tarsus.

CHYSOTUS ’CTCOR>S, Loew. ’Length .5-.25 mm. length of wing .75-2. FII IYI,

Palpi pale, somewhat blackened at theirbases, and clothed with a few scattered, longblackish hairs; eyes contiguous on the facein the male; face of the female moderatelybroad, dusted with white and presentingnear the oral margin a slight swelling, oneach side of which, abutting on the orbitlies a small rectangular black spot. An-tennae in both sexes with the basal joint paleyellow, the two apical joints deep black,clothed with rather abundant pale pubescence;arista inserted apically. F’ront and occiputmetallic green, dulled by a layer of yellow-ish dust; cilia of the superior orbit black,those of the inferior orbit glisteningwhite, very conspicuous in some specimens.Thoracic dorsum and scutellum metallicgreen, considerably dimmed by a layer ofyellow dust, thickest on the anterior portionand on the humeri; pleurae metallic green,inclining to blackish, dusted with white.Tegular cilia black. Abdomen copperygreen, not very vivid, with the incisuresnarrowly blackish, the terga covered withshort pale hairs which appear black in somelights and are somewhat more appressed inthe female than in the male; hypopygiuminconspicuous, its longer appendages paleyellow. Legs pale yellow, moderately hairyfore coxae blackened only at their extremebases posterior coxae with their basal halvesblackened. Tarsi blackened only towardstheir tips. Hind femora with prominentpreapical bristle. Halteres honey yellow.Wings grayish hyaline; posterior cross veina considerable distance in front of the middleof the wing.

June 189o.] PS 7"CttE. 359

HAB1TAT Milwaukee Co., Wis.Loew’s description of this insect is

so brief, being taken fl’om a singleimperfectly preserved specimen, that Ihave seen fit to describe it again. Thesmall size of the species, the pale colorof the first antennal joint, which Loewdescribes as red, but which is reallypale yellow in well-preserved speci-mens,-and the locality (Loew’s speci-men was from Illinois) are proof suffi-cient that my specimens are true19. picticornis. The species is com-mon in damp woods near Milwaukee.

DIAPHORUS SATRAPA, n. sp. OLengtl 2 mm. length of wing t.75 mm.Palpi rich brown; face narrow, covered

with thick silvery white dust; antennaeyeIlowishbrown, hairy; third joint pointed(vith dorsally inserted arista?) Front andocciput bronze black, with violet reflection,shifting to cupreous posteriorly, the surfacecovered with very fine appressed whitehairs; inferior orbit thickly powdered vithwhite dust; cilia glistening white. Tho-racic dorsum vivid blackish bronze, withashining violet patch on the disc, borderedon each side bya broad and obscurelyde-fined cupreous band. Scutellum flattened,vivid bronze green. Pleurae bronze green,covered with silvery dust; there is a patchof thick white dust on the humerus, very con-spicuous when the insect is viewed fromabove, and extending down to the insertionof the fore coxa. Tegulae pale yellow, withwhite cilia. Abdomen slender, covered withrather stout black hairs; basal segmentbronze green; second and third segmentspale yellow, the latter bronzed on its pos-terior border; remaining segments vividblackish bronze; hypopygium brownish,scarcely protruding, covered with pale yel-low hairs. Coxae and feet pale yellow,

somewhat slender and not very hairy; forecoxae bearing on their anterior faces severallong yellowish brown hairs; median coxaesimilarly adorned, one of the hairs, however,is very long and blackish; median femurwith two stout blackish spines near the apex-Fore and median tarsi blackened towardstheir tips, the former very slightly, the lattermore conpicuously. Hind legs only moder-ately hirsute; apical half of each femurbrown on the upper face; tibiae brownishand the tarsi, excepting the extreme base ofthe first joint, deep brown. Halteres honeyyellow. Wings more brovnish than gray-ish hyaline, owing to the brown veins andthe rather thick covering of microscopicbrown hairs; posterior cross-vein very nearthe middle of the wing; third and fourthlongitudinal veins gently curved but stillparallel; anal angle not prominent as inseveral other species of the genus.

HABITAT: Saline Co., Nebraska.My single specimen of this beautiful

Diaphorus has lost the tips of the an-tennae and of several of the tarsi, so thatI can assert nothing in reard to the in-sertion of the arista or the developmentof the pulvilli. The other form-characters, however, agree so wellwith those of other species of Dia-phorus that I do not hesitate to assignit to this genus. The color of the abdo-men is very unlike that of any describedNorth _American lgiaphorts, but ap-proaches the European D. tr@ilzts,Loew, 2!). ho.ff’mannseg’ii, Meigenand g. oculatus, Meigen, being close-ly allied to the latter. These Europeanspecies form a subgeneric group cha-racterized by the more or less extendedyellow band encircling the base of theabdomen. Heretofore no members of

360 PSZ’CHE. [June x89o.

this group have been described fromAmerica; in all of Loew’s species theabdomen is lnetallic green (or in D.@acus black) throughout. Loew re-cognized the fact that the Americandiaphori are especially heterogeneous,but with his usual fine judgment de-clined to resolve the genus into several.Such an attempt even at the presenttime, would be unwise, as I am con-vinced that there are still many NorthAmerican species awaiting descrip-tion.

DIAPHORUS PALPIGER, n. sp. O

Length 2,75mm.; length of wing2. 5 mm.Palpi very prominent, as long as the face,

from the insertion of the antennae to theoral margin glistening white, golden yellowat their bases, with a few long silvery hairson their edges. F,ace broad, covered withyellow dust and presenting a somewhatshallow, v-shaped depression near the oralmargin. Antennae black, apical joint morepiceous, hairy, twice as broad as long, reni-form with subapical arista. Front and oc-ciput broad, without any tendency to con-tiguity in the eyes, covered with the sameglistening yellowish dust as the face; ciliaof the superior orbit short and black, thoseof the inferior orbit very long and silverywhite, forming a conspicuous, though notvery dense beard when the head is seen inprofile. Thorax and scutellum goldengreen, their brilliancy much subdued by athick layer of yellow dust most abundant onthe anterior half of the thoracic dorsum andon the lateral corners of the scutellum;pleurae greenish black, dusted with white,the yellow dust of the thoracic dorsum ex-tending over the humeri on to the anteriorpleurae a short distance. Tegulae pale yellowwith yellow cilia. Abdomen metallic green,not vivid and less golden than the thorax

and scutellum; intersegmental incisuresnarrowly black as are also the short robusthairs covering the segments; hypopygialappendages pale yellow. Coxae concolorouswith the pleurae, dusted with white. F’emoraslightly enlarged, black on their innerand lower faces, which are dusted withwhite but metallic green on their upperfaces; knees rather broadly pale yellow;tibiae and tarsi black, inclining to piceous atthe joint; pulvilli dilated on all the feet.An even row of britles runs the full lengthof the under surface of the fore femur, anda long and stout bristle projects from the an-terior face of the median trochanter. Pos-terior legs hirsute lbesides the usual shortbristles clothing the tibiae, there is a row ofprominent bristles on their anterior and pos-terior faces. Halteres honey yellow. Wingsgrayish hyaline, third and fburth longitudinalveins gently converging near the apex of thewing, but becomig parallel just beforetheir termination; anal angle not veryprominent; sixth longitudinal vein distinct.

HABITAT: Milwaukee Co. Wis.This species is so different from

all the species described by Loew,that no diculty will be experienced inrecognizing it. Its dark colored legsand pale tegular cilia place it in thegroup comprising Loew’s D. leucos-tomus and D. interruptus. The lackof a conspicuous point to the third an-tennal joint immediately distinguishes itfrom the former, while the uninter-rupted fourth longitudinal vein as readi-ly distinguishes it fi’om the latter.

DIAPHORUS RAUTERBERGI, n. sp. .Length 3 mm. length of wing 2. 5 mm.

Palpi small, fuscous with paler edges. Face,somewhat narrowed below, evenly roundedwithout any indication of a transverse swell-

June I89o.] ISCttE. 361

ing, covered vith coarse yellowish dust. An-tennae black, basal joint short, third jointlarge, hairy, much shortened and expandedso as to appear kidney-shaped arista appar-ently with apical insertion. Front subquad-rate, together with the occiput covered withcoarse yellowish dust; cilia of the superiororbit short and black; those of the inferiororbit long and conspicuous, of a yellowishtint. Thoracicdorsum, scutellum and abdo-men metallic green, covered with coarse yel-low dust, which is very thick on the thoraxand scutellum, but much less so on the abdo-men. Pleurae black, dusted with white, theanterior portions more tnetallic green. Tegu-lar cilia pale yellow, appearing brown insome lights. Abdomen covered with shortb[ack hairs, which are almost lacking on theterminal segment where they are prominentin other species; hypopygium black, the tipsof the concealed appendages pale yellow.Coxae black, dusted with white. Femoravivid metallic green, broadly tipped with yel-low; tibiae and tarsi yellow, the latter withenlarged pulvilli on all the feet; anteriortat’si blackened from the tip of the first joint;hind tarsi brown from the tip of the firstjoint, only the last joint more blackish. Theblack hairs and spines on the legs of aboutthe usual letagth. Halteres honey yellow.Wings grayish hyaline, with brown veins,which become yellow towards their origin;hird and fourth longitudinal veins nearlyparallel on the apical third of the wing; pos-terior cross-vein at about the middle of thewing; anal angle not very promi,ent.

HABITAT" Saline Co., Nebraska.The peculiar confiKuration of the

third antennal joint readily distinguishesthis species from 2!?. leucostomus, towhich it is in most other respects close-ly aliated.

PORPHYROPS LONGIPES, LOEW. (.Length 3.5 mm: length of wing 3 ram.Palpi black, with a few rather long black

hairs. Face narrow, silver.}, white; antennaeblack, basal joint smooth and rather slender;third joint flattened, lanceolate, a little morethan twice as long as broad at the base, cov-ered with short and even pubescence, apexsomewhat rounded; arista straight, distinctlylonger than the whole antenna, with ap-pressed scarsely perceptible pubescence.Front and occciput metallic green, slightlydimmed by a layer of vhitish dust; cilia ofthe superior orbit black, those of the inferiororbit silvery white, abundant and increasingin length to,yards the oral orifice. Thoracicdorsum and scutellum dark metallic green,shining sometimes with a slight cupreous re-flectio the former with traces of white dustlines on its anterior part; pleurae greenishblack, overlaid with whitish dust. Tegulaepale yellow with silvery white cilia. Abdo-men concolorouswith the thoracic dorsum,terminal segments more violaceous; thehairs with which it is rather abundantly cov-ered are black, except on the lateral surfacesof the basal segments where they are long,tufted and silvery white hypopygium shin-ing black, the external appendages long andfiliform, sometimes coiled up in dry speci-mens, pale yellow, strongly infuscated attheir edges and clothed with conspicuousblack and white hairs; claspers and internalappendages blackish. Coxae blackish green,tipped with pale yellow, each bearing on itsanterior face a tuft of silvery white hairs,which are longest and most abundant on thefore pair. Legs hair.y; the fore and mediumpairs pale yellov, the former with the femorablackish green, excepting their bases andapices; tarsi blackened from the tip of thefirst joint; metatarsal joint of the fore feethardly as long as the remaining tarsal jointstaken together; there are several long whitehairs on the posterior faces of the fore femoramedian femora somewhat longer and moreslender than the fore femora; hind legselongated, femora, tibiae and basal tarsaljointsincrassated, deep black with the ex-ception of the basal halves of the femora,

362 PSUCttE. [June I89o.

which are pale yellow; the hind tarsi thoughincrassated at the base taper evenly to thelast joint. Halteres honey yellow. Wingssomewhat lanceolate at their bases, gray,with blackish veins; the third and fourthlongitudinal veilas at first converge gently,but on approaching the tip of the wingbe-come parallel, the fourth terminating a veryshort distance in front of the tip.

HABITAT Milwaukee Co., Wis.

The three males in my collectionagree with the above description, whichwill be found to differ somewhat fromLoew’s account (Monograph, p. 34o,also Centuria 5" 92) The less pig-mented hind legs in Loew’s specimen,taken in the White Mountains, mayhave been due to immaturity. I believethat my specimens represent the nor-mal adult male, though it is, of course,possible that they may belong to a west-ern variety with highly pigmented hindlegs. Be this as it may, the differencesseem hardly of specific value.

SYNARTHRUS CINEREIVENTRIS, LOEW. ’.To Loew the male of this species was un-

known. It differs fl-om the female as de-scribed by that dipterologist, only in thestructure of the antennae and the spinulationof the legs, the coloring of my specimenanswering perfectly to the color-descriptionof the female. The first antennal joint israther slender, especially at its base, the sec-ond overlaps the inner side of the third by alarge rounded flap as in the female; the thirdjoint is long and tapers slowly to an acute

point in such a manner as to have the con-tour of its dorsal side remain straight orslightly concave, while the contour of itsventral edge is convex; the pubescence cov-ering the joint is shorter and less conspicu-ous than in S. barbatus, Loew; the aristawhich is a little over half as long as the an-tenna, is rather delicate and clothed withscarcely perceptible pubescence. The spinu-lation of the legs in the female is not de-scribed by Loew, probably because it pre-sented nothig worthy of remark. The malehas a delicate and rather long spine project-ing fi’om the upper surface of the tip of themedian femur, while there are six or sevenshort, stiff and evenly graduated spines be-fore the middle of its under surface; the in-ner face of the median tibia has three widelyseparated black spines; the posterior face ofeach of the hind tibiae is armed with abouteight equidistant black spines, besides theregular rows of shorter and smaller spines;the two spurs at the apex are powerfully de-veloped, of equal length, and, in nay speci-men, directed at right angles to the long axisof the tibia; hind metatarsal joint with sev-eralprominentspines on its under surface;on the inner face of its proximal end a pecu-liar sickle-shaped spine, bent back in theopposite direction to all the other spines, sothat its curved and pointed end comes to lienear the tip of the tibia. This peculiar spineis inserted near the middle of the metatarsaljoint, to the surface of which it is applied forsome little distance. The abdomen is small,with small, black, and in my specimen, muchconcealed hypopygium. Length 2. 5 ram.;length of wing 2. 5 ram.

HABT.T Milwaukee Co., Wis.(To be concluded.)

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