94 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



Female. — Face wide, brownish gray to whitish in color; hind tibiae 

 not thickened, without the brown stripe on inner surface, and the 

 glabrous stripe on upper surface not conspicuous; wings with the 

 anal angle less prominent, although of somewhat equal width. Other- 

 wise about as in the male. Middle tibiae with one large bristle below, 

 their basitarsi without a bristle above, but with several very small 

 ones below. 



Described from 6 males and 2 females; 5 of the males and the 2 

 females were taken at Moscow, Idaho, June 19, 1900; 1 male was 

 taken at Lafayette, Indiana, August 13. All were taken by J. M. 

 Aldrich. 



Ti/^e.— Male, Cat. No. 23002, U.S.N.M., from Idaho. 



No. 52. DOLICHOPUS GROENLANDICUS Zetterstedt. 



Dolichopus groenlandicus Zetterstedt, Diptera Scand., vol. 2, 1843, p. 528. 



Male. — Length 4.3-4.8 mm. ; of wing 4.8-5 mm. Face moderately 

 wide, yellowish brown. Front bronze brown or more or less greenish, 

 not very bright. Antennae wholly black; third joint rather large, 

 a little longer than wide, oval, rounded at tip. Palpi black. Orbital 

 cilia wholly black. 



Thorax bronze brown with slight green reflections, dulled with 

 brown pollen on the dorsum; pleurae with grayish pollen. Abdomen 

 bronze brown, or green with dark bronze reflections, the white 

 pollen on its sides abundant. Hypopygium black; its lamellae 

 (fig. 52a) of moderate size, somewhat c{uadrilateral in outline, brown 

 but not very dark, the edges only slightly darker, jagged and bristly 

 on apical margin, fringed above with rather long and slender brown 

 hairs. 



Coxae black; anterior pair with conspicuous little black hairs. 

 Fore femora blackish on basal half, yellow apically, the black variable 

 in extent. Middle femora yellow with a black or brownish streak 

 on lower edge at base, with one preapical bristle in front and a small 

 bristle close to tip on posterior side. Hind femora black with extreme 

 tip yellow, with one preapical bristle, the hair on upper edge at base 

 long, not ciliated below. Tibiae yellow; middle pair with one long 

 bristle below; posterior pair a little thickened, black at tip for one 

 fourth their length, with strong bristles, the glabrous stripe on upper 

 surface distinct, inner side with a wide glabrous stripe, which reaches 

 the whole width at basal third, where there is a short brown streak. 

 Fore tarsi one and a fourth times as long as their tibiae, black from 

 the tip of the first joint, this joint as long as the tliree following 

 taken together, fourth and fifth of nearly e(iual length, third a very 

 little longer than the fourth. Middle tarsi one and a third times as 

 loag as their ti])iae, black from the tip of the first joint, which is dark 



