344 . DIPTERA 
106. Antenne and palpi yellow; tarsi entirely yellow; abdomen 
with interrupted pollinose fascize; first gene cell greatly 
narrowedattip . . . . 3 - . P. HaRPIGER, Melander. 
Antennz and palpi black; tarsi more or i» pereta 
abdomen not pollinose . . . 1 s * eS aces uu d M cu LETT TN 
107. Middle femora without yellow setze in STE coxa iud legs 
yellow, tarsi weakly annulate; cilia of hind margin of the 
wing cf nearly as long as the posterior crossvein ; arista 
longer than third antennaljoint . . . . . . . . . P.nmasrarus, Melander. 
Middle femora with conspicuous yellow sete in front; cilia enc So E 
of the hind margin ofthe wing short; palpi blackish inside . . . . . . . . . . . 108. 
108. Epistome shining ; tarsi weakly annulate; third vein straight; : ; 
middle section of fifth vein shorter than thelastsection . . . . . . . . . . . . I09. 
Epistome heavily pruinose; tarsi strongly annulate . . . . . . . . . 100. 
109. Body black; middle femora with at most a spot of brown . | P. surog, Melander. ; 
Body castaneous; all the femora annulate with brown or 
bláck 3 FEE 3 . P. aRCTICUS, nov. sp. (1). 
110. Posterior coxc Fon at bald] died cply thé ide : 
pair, with dark spot or ring; arista obviously longer than 
third antennal joint, middle section of fifth vein longer than 
the others . . . eae «5. P. ARMILLATUS, nov. sp. (2). 
Cox: and femora yuddnt arista ibid to third joint; last 
two sections of fifth vein subequal . . . . . . . . P. xqvauis, Loew. 
(1) Platypalpus arcticus, nov. sp. — Female. Length 2 mm. Blackish brown, thorax dusted, sternopleurae 
partly shining, bristles yellow, legs yellow, the femora broadly ringed with brown, tibial spur long, third antennal joint 
elongate oval, posterior crossvein oblique and located beyond the anterior. Occiput and front with yellow pollen, face 
whitish, nearly as broad as the front, the latter with nearly parallel sides, epistome shining; proboscis black, nearly 
as long as the head height, palpi blackish within, coated outside with yellowish; antennae rather short, black, the third — 
joint ovate, one-half longer than broad, the arista twice as long as the antenna. Mesonotum shining through the 
yellowish coating, bristles yellow, pleuraz whitish tomentose, the sternopleura largely — € 
of the posterior coxz brown, the dark band of the middle femora strongest, wat oí ie hlád feitorl 
middle, front and middle femora distinctly biseriately setose beneath, the setze of the 
short-ciliate outwardly, slightly thicker than the middle pair, middle tibie threc-fourths as long as 
apical spur longer than the diameter of the tibia, slender and acute, tarsi weakly annulate, almost 
tip. Halteres yellow, calypteres with pale fringe. Wings with a yellowish tinge, veins light brown, anal crossvein 
forming an angle of sixty degrees, sections of the fifth vein proportioned 1 : 1 : 1.3, third and fourth veins nearly 
parallel, marginal cilia short. 
Four cotype specimens, received from the U. S. National Museum; Fort Chimo, Ungava Bay, Labrador; L. M. 
Turner, collector. 
(2| Platypalpus armillatus, nov. sp. Length 2.6 mm. Black; front and face of equal width, with parallel 
sides, front cinereous, face and epistome white pruinose; palpi elongate oval, black inside, white pruinose outside and 
with two apical setze, proboscis black; antennz black, apparently two-jointed, the last joint elongate oval, slightly more 
than twice as long as wide and three-fourths as long as the arista, cephalic bristles yellow, one pair each of vertical 
and ocellar bristles, Mesonotum moderately densely covered with cinereous pollen, its bristles yellow, the humeral 
bristle small, several notopleurals, one supraalar, one postalar, two dorsocentral and four scutellar bristles, acrostichals 
biseriate and weak; pollen of pleurz whitish, anterior half of the sternopleurz glabrous; abdomen shining black, 
pygidium moderately large, the dorsal valve with a yellow fringe. Base of the posterior coxe black, remainder of the 
legs testaceous, the tarsi rather strongly annulate, posterior femora with a more or less developed blackish ring at the 
outer two-thirds, in the O much less distinct, sometimes wanting, front femora with long cilia beneath, middle femora. 
with some setze in back, middle tibiz two-thirds as long as their femora, the spur strong. Veins coarse and black, 
first vein thickened on entering the costa, costal sections two to four proportioned 6 : 2.3 : 1, third and fourth veins 
slightly incurved, posterior crossvein oblique, twice as long as the anterior, the space between the crossveins equal to 
the anterior crossvein, sections of the fifth vein proportioned 0.8 : 1.3 : 1, anal crossvein at an angle of 80 degrees, 
anal vein very weak, vanishing at both ends, marginal cilia equal in length to the anterior crossvein. 
Seventeen specimens, type from Almota, Washington, elevation 600 feet. Paratypes from Pullman, Clarkston, 
Kettle Falls, Oroville and Omak, Washington; Kendrick, [daho (Melander) and Bozeman, Montana (R. A. Cooley). 
