THE DIPTEKOUS GENUS DOLICHOPUS IN NORTH AMERICA. 175 



June to September (Cole); Tallac Lake, Tahoe, California, June 25; 

 Nelson, British Columbia, July 17. 



Type localities. — Wyoming and Manitou, Colorado. 



Type. — In University of Kansas. 



No. 122. DOLICHOPUS PERNIX Melander and Brues. 



Dolichopus pemir Melander and Brues, Biol. Bull., vol. 1, 1900, p. 141, fig. 



Male. — Length 4.5-4.75 mm.; of wing 4-4.5 mm. Face moderately 

 wide, narrower on lower half, white, more or less tinged with yellow, 

 especially on upper portion. Front shining green. Antennae 

 wholly black; first joint slightly brownish below; third joint longer 

 than broad, oval, still rather pointed at tip. Palpi yellow with black 

 hairs. Lateral and inferior orbital cilia yellowish, from five to eight 

 of the upper cilia on each side black. 



Thorax green with more or less bronze or coppery reflections; 

 dorsum somewhat dulled with almost invisible gray pollen; pleurae 

 dulled with white pollen. Abdomen green with coppery reflections 

 near the hind margins of the segments, incisures narrowly black, 

 the white pollen on its sides extending upon the dorsum so as to 

 leave the central line blackish. Hypopygium black; its lamellae 

 (fig 122a) of moderate size, somewhat elongate-oval in outline, still 

 quite pomted at tip, twice as long as wide, yellowish white, narrowly 

 brown at apex, with one or two long branched bristles at tip, fringed 

 above with small brown hairs, below and on the disk with delicate 

 yellow hairs. 



Fore coxae yellow with a black spot at base on outer side, their 

 anterior surface with little black hairs and a few minute yellow ones 

 near outer edge. Outer surface of middle and hind coxae black with 

 yellow tips. Femora and tibiae yellow. Middle and hind femora 

 each with one preapical bristle, the latter nearly glabrous below. 

 Posterior tibiae a little thickened, black at tip for nearly one-fifth 

 their length, this black sharply defined; the usual glabrous stripe on 

 upper surface although broad does not reach the base and is some- 

 what broken by a few little black hairs; (Melander and Brues in the 

 original description write "hind tibiae not glabrous internally," but 

 in all the specimens before me the upper half of the inner surface is 

 glabrous, beginning near the base where it is wide and contains a 

 brown streak in most specimens; probably the word "not" in the 

 original description should have been omitted). 



Fore tarsi (fig. 122&) one and a half times as long as their tibiae, 

 first joint two-thirds as long as the tibiae, third joint only slightly 

 shorter than the second, taken together they are a little longer than 

 first; first three joints yellow; fourth and fifth black, a little com- 

 pressed and expanded, of nearly equal length, the two taken together 

 about as long as second. Middle tarsi one and a fourth times as 



