328 DIPTERA 
as wide; incisures of the abdominal segments ochraceous ; 
proboscis and palpi obliquely porrect; robust species . . P. PRORSUS, nov. sp. (1). 
46. Pleurz entirely shining, only the pectus above the front cox : 
pollinose; base ofthe antennz fuscous (montauus, Melander). P. sPLENDENS, new name. 
Pollen conspicuous along the notopleural suture and on the 
propleurz ; base of the antennze yellow (gilvifes, Coquillett). P. xaNTHOPODUS, new name. 
47. Femora more or less marked with black, the hind femora 
always dark toward theapex;tarsi notannulate. . . . . . . . . . . . . ... 48 
Legs yellow and usually slender . n i 
48. Front femora with a round black apical spot, hind AS 
dark toward apex, legs otherwise yellow; middle femora i 
with regular long black bristles below; tibize without spur. P. aPicaLis, Loew, 
Front femora without round black spot; middle femora with 
long black bristles below; tibie without spur; middle : 
femora, anterior tibie and all tarsi black. . . . . . P. GESTICULOR, nov. sp. (2). 
Front femora without round black spot, middle femora at 
most with weak pale bristles beneath; T otherwise 
colored . i MER - MT EP . 49. 
49. Front rather narrow ES TEL anterior ic 
blackish above; third antennaljoint oval . . à Lc E DUE DC UE HI NMMN 
Front shining and usually broad; spur of the middle tibiae 
minute or wanting, anterior femora not blackish. dn 25058. 
(1) Platypalpus prorsus, nov. sp. — Female. Length 3 mm. Related to lateralis Loew, but robust, with 
broad face, black proboscis, incisures of the abdomen narrowly ochraceous and with short sparse notal hair. Head 
opaque gray pollinose, except the shining epistome; sides of the front nearly parallel, face very short; proboscis 
geniculate, bending forward below, although this may be accidental in this specimen, the — palpi also porrect; - 
bristles yellowish; base of the antennz reddish, the third joint conical, brown, hairy, about two and one-half 
long as wide and subequal to the arista. The hairs of the third joint are shorter and the arista is thinner 
lateralis, Thorax shining black, the sides, encroaching above the humeri, whitish pollinose, like the S 
sternopleurze largely shining, bristles whitish, three pairs of scutellar bristles; terminal segments of the abdomen 
shining, the styles slender and hairy, about five times as long as wide. Legs ystoe! the tarsi very weakly annulate, 
middle femora robust, about seventeen black setul;ze in the posterior row, middle tíbiz five-sixths as long as 
femora, no tibial spur but the flexor end sharply truncated. Veins brownish, the second, third and fourth sections of 
the-costa proportioned 4.5: 2.3 : 1, third vein ending before the wing-tip, nearly parallel with the fourth, sections of 
the fifth vein proportioned 1: 1.2: 2.2, marginal cilia shorter than the anterior crossvein. 
One specimen, in the U. S. National Museum, collected by L. M. Turner, at Ungava Bay of Hudson Straits, 
Northern Labrador. 
(2) Platypalpus gestioulor, nov. sp. — Male. Length 2.5 mm. Body black, notum mostly shining, legs 
variegated, spur of middle tibiz lacking, antennz black, third antennal joint very small. Front broad, olivaceous, 
face gray, epistome shining, proboscis black, palpi yellow, rather prominent, cephalic bristles very small; third antennal 
joint ovate, about one-fourth the length of the slender arista. Mesonotum with double but contiguous acrostical row 
and dorsocentral patches of pubescence, notopleural suture broadly pollinose, pleurze mostly bare and polished ; bristles 
reduced, yellowish, no humeral, Abdomen shining, with loose yellowish hairs, pygidium globular forming a rather 
large rounded ending tothe abdomen, Coxe pale yellow, all tarsi black, front femora luteous, front tibize black except 
toward knees, middle femora black except toward base, with fourteen strong black setz in the posterior row, middle 
tibiz black, the apical third with matted golden pubescence, hind femora and tibie each dark on the distal half. 
Calypteres, fringe and halteres yellow. Wings hyaline, three times as long as wide, veins thin and brown, costal 
sections proportioned 6 : 4 : 2.3 : 1, third vein ending at the middle of the wing-tip, parallel with the fourth, 
crossveins located near one-third the wing-ength, the distance between them less than the length of the anterior 
crossvein, posterior crossvein nearly transverse, outer sections of the fifth vein proportioned 3: 5, anal crossvein 
reflexed at an angle of 5o degrees, anal vein faint. 
Female. Color of legs much less intensive. 
Foot of Lake McDonald, Glacier National Park, Montana; August 14, 1916 (Melander). 
WIS wi is 2 
