THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 215 



At the last minute I have decided that a series described as new 

 were really this species; the specimens were all from Colorado and 

 the drawing was made from one of these specimens. 



Type. — In the University of Kansas, from Colorado. 



No. 155. DOLICHOPUS LOBATUS Loew. 



Dolichopus lobatus Loew, Neue Beitr., vol. 8, 1861, p. 24; Mon. N. Amer. Dipt., pt. 

 2, 1864, p. 72.— Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 16, pi. 1, 

 fig. 20.— CoQuiLLETT, Proc. Wasli. Acad. Sci., vol. 2, 1900, p. 425.— 

 Melander and Brues, Biol. Bull., vol. 1, 1900, p. 148. — ^Johnson, Insects 

 of New Jersey, 1909, p. 756. 



Male. — Length 5.5-7 mm.; of wing 5-6 mm. Face rather wide, a 

 little narrowed below, pale yellow, more white below. Front shining 

 green with bronze reflections; first two antennal joints yellow; third 

 black, somewhat oval, but little longer than wide, obtusely pointed 

 at tip. Lateral and inferior orbital cilia yellowish, about six of the 

 upper cilia on each side black. 



Thorax green with bronze, sometimes blue, reflections; dorsum 

 often with a median copperv" vitta, covered with an almost invisible 

 yellowish gray pollen; plem'ae dulled with white pollen. Abdomen 

 green with bronze, sometimes violet, reflections; the white pollen on 

 its sides abundant, reaching upon the dorsum. Hypopygium black, its 

 lamellae rather large, somewhat oval in outline, tAvice as long as wide, 

 white with a wide l)lack border on the apical margin, which is jagged 

 and bristly on the lower half, fringed above with black hairs. 



Fore coxae yellow, their anterior surface covered with delicate 

 yellow hairs, sometimes with a few minute black ones on inner edge; 

 middle and hind coxae yellow with their outer surface more or less 

 black. Femora and tibiae yellow, middle and hind femora each with 

 one preapical bristle, the latter without cilia below, but with a row of 

 delicate little yellow hairs on the lower inner edge. Posterior tibiae 

 thickened, especially in the middle, sometimes a little darkened on 

 apical half of imier side; the glabrous stripe on upper surface broad 

 but broken by little hairs. Fore tarsi (fig. 155a) one and a, third 

 times as long as their tibiae, first three joints slender, yellow, some- 

 times a little infuscated from the tip of the first joint, fourth and 

 fifth joints black; first joint as long as the three following joints taken 

 together, second two-thirds as long as first, third half as long as second, 

 fourth half as long as third, about as wide as long; fifth much com- 

 pressed, longer than second, somewhat oval, about two thirds as 

 wide as long, fringed above with black hairs; middle tarsi a little 

 longer than their tibiae, black from the tip of the first joint, which 

 has a large bristle above at apical third; hind tarsi wholly black. 

 Calypters and halteres yellow, the former with black cilia. 



Wings (fig. 155) grayish, sometimes tinged a little with yellowisli 

 brown along the front ; costa scarcely enlarged at tip of first vein ; 



