318 DIPTERA 
Posterior crossvein located near the anterior, second basal and 
first posterior cells normal; legs black except the brownish. 
trochanters, knees, hind tibi: and bases of the tarsal joints P. LuPATUs, Melander. 
4. Hind femora and all the tibiz yellow, tarsi sharply annulate. P. CoouiL.LETTI, Melander, cf. 
Hind femora middle tibize and middle tarsi black, front tarsi 
darkatthebase . . . jose ce i . . . P. racuycuEMUs, Loew. 
5. Some s the femora in MS at least vullowidb: crossveins 
AI die RAE black; oxcogt domditiiid d theknees . . 1. .— | 23. 2 2E a UTI ME 
6. Thorax shining, its bristles yellow; tibize yellow, tarsi piceous; 
third antennaljoint oval . . i: ; : VW Vires eco DELE 
Thorax poltinose and pubescent, its bristles black; oii Hus 
entirely yellow, the other tarsi more or less annulate, 
spur of the middle tibiz very strong; third antennal joint 
lanceolate, equal to arista . . . ; - .« . . P. DISSIMILIPES, nov. sp. (r). 
7. Front opaque pollinose; antenna reddish; Pm i entirely 
yellow, the middle femora black and with strong black 
setze, the hind femora black on the apical half, spur of 
middletibielong. . . . . i 05.5 ov P. VERSIPBS, OY. Sp. (3). 
Front shining; antenne black; roni i paity dark, the 
middle femora without black setze, tibialspur short. . . . . . . . . . . . . . 8 
s 
8. Front femora above and the posterior femora apically black, 
the base of all the femora yellow, anterior femora yellow- 
ciliate beneath, front coxe yellow .. . . . . . . . P. nwvznsiPES, Coquillett, 
(1) Platypalpus dissimilipes, nov. sp. — Length 2 mm. Black, cinereous, subpollinose, legs yellow, the — 
posterior femora black, bristles black, crossveins contiguous. Front and face somewhat whitish when viewed from 
below, two pairs each of long ocellar and vertical bristles; palpi small, whitish, with a long subapical dark hair ; third. 
joint of antennze lanceolate, twice as long as wide, the rather strong arista equal to the antennal length. Dorsum of. 
thorax subshining although evidently pollinose, its bristles strong, one humeral, one notopleural, one supraalar, one 
postalar, one dorsocentral, four scutellar bristles, four rows of acrostichals and numerous lateral setulze ; glabrous spot 
of sternopleurz large; abdomen shining, each segment with a single subdorsal pit, pygidium small, its hairs sparse 
and black. Middle femora stout, coarsely black-setulose and spinose beneath, front femora sometimes brownish along 
the middle, underneath subciliate with pale hairs, spur of middle tibize long and strong and with a black tip, last 
tarsal joint blackened. Costa not swollen at the insertion of the first vein, its second, third and fourth sections 
proportioned 3,5 : 2.4 : 1, third and fourth veins parallel, crossveins meeting, the posterior crossvein nearly transverse, 
anal crossvein forming an angle of eighty degrees, anal vein represented by a pronounced fold, 
Fifteen specimens, type from Moscow Mountain, Idaho, June 12, 1910 (Melander). Paratypes from Moscow, Troy 
and Waha, Idaho; Mount Constitution, Winlock, Pluvius and Ilwaco, Washington; Eagle Creek, near Portland, Oregon 
(Melander); Kaslo, British Columbia (R. P. Currie); and Colorado (C F. Baker). 
(2) Platypalpus versipes, nov. sp. — Male. Length 2.2 mm. Mesonotum shining, head pollinose, front 
legs yellow, middle femora and apical half of the hind femora black. Sides of the opaque front slightly diverging 
above, face short, as broad as the bottom of the front, anterior part of the epistome pollinose; palpi yellow, 
proboscis blackish; vertical and ocellar bristles black; antennes brown, the third joint short-ovate, the arista less than 
twice as long as the antenna — Sides of the thorax lightly pruinose, sternopleura and a central spot on the hypopleura 
glabrous, bristles blackish, notal hairs moderately long and blackish. Abdominal hairs short and sparse, pygidium 
small and nearly bare. Front coxe yellow, posterior coxe blackish, anterior femora robust, the front pair not ciliate, 
middle femora setulose with black bristles in back, posterior tibiz and tarsi yellow, the last joint of the tarsi dusky, 
the middle patella black, middle tibiz twc-thirds as long as their femora, the spur longer than the diameter of the 
tibia and tipped with black, Veins yellowish, third and fourth veins subparallel, the first posterior cell widest beyond 
its middle, second, third and fourth sections of the costa proportioned 1: : 0.6 : 0.2, Crossveins meeting, sections of the 
fourth vein, 1 : 1.8; of the fifth vein 0.5: 0 6: r, base of the anal vein wanting, — cilia shorter than the 
anterior crossvein. 
One specimen, Falls Church, Virginiá, May, received from Nathan Bauks. 
