24 COQUILLETT [4^0] 



white; thorax opaque, gray pruinose, mesonotum marked with four, 

 slightly polished, black vittae, scutellum bearing from four to six black 

 bristles ; abdomen of male polished black in middle of dorsum, the sides 

 opaque, gray pruinose ; in the female the dorsum of segments two to 

 four, and all of abdomen beyond the fifth segment is polished black, 

 remainder of abdomen opaque, gray pruinose ; hypopygium of male 

 rather small, obliquely ascending, claspers destitute of processes, dor- 

 sal piece with a broad emargination in its posterior end almost reach- 

 ing its center, central filament hidden, venter destitute of processes and 

 of spinous bristles; legs of male simple, femora destitute of bristles and 

 long hairs, first joint of hind tarsi noticeably thicker than that of the 

 front ones ; legs of female ciliate with nearly erect scales on both sides 

 of the hind femora and tibiae, middle femora and apical half of upper 

 side of the front femora; wings unusually long and narrow, grayish 

 hyaline, stigma and veins, except at base of wing, dark brown, vena- 

 tion normal. Length 7 mm. A specimen of each sex, collected 

 July 21. 



Habitat, — Saldovia, Kenai Peninsula, Alaska. 



Type. — Cat. no. 5213, U. S. National Museum. 



Empis triangula sp. nov. 



Black, the halteres and legs dark brown, knees yellow, this color 

 rarely extending over the greater portion of the femora and sometimes 

 of the tibiae, venter of abdomen of female largely yellow; eyes of 

 male contiguous, third joint of antennae nearly linear, at least five 

 times as long as broad, the style scarcely perceptible; proboscis from 

 one and a-half to twice as long as height of head ; hairs and bristles 

 of thorax and scutellum black ; thorax somewhat polished, very thinly 

 gray pruinose, not distinctly vlttate, scutellum bearing ten marginal 

 bristles ; abdomen slightly polished, hypopygium of male rather large, 

 obliquely ascending, the lower piece bearing a cluster of rather long, 

 black bristles at its apex, filament hidden, venter of abdomen destitute 

 of processes and of spinous bristles ; legs simple, slender, almost bare ; 

 wings hyaline, veins and stigma brown, second submarginal cell 

 somewhat triangular, pointed at its base, about one and one-half 

 times as long as broad, discal cell subequal in length to last section of 

 fourth vein, last section of fifth vein half as long as the preceding sec- 

 tion. Length 2 to 3.5 mm. Eight males and eighteen females. 



Habitat. — Lowe Inlet, British Columbia, June 3 ; Farragut Bay, 

 June 8; Sitka, June 16; Yakutat, Alaska, June 21. 



Type, — Cat. no. 5214, U. S. National Museum. 



