THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 261 



Type. — ^In museum of Comparative Zoology, Cambridge, Massachu- 

 setts. 



No. 191. DOLICHOPUS SICARIUS, new species. 



Male. — ^Length 5 mm. ; of wing the same. Face long and rather 

 wide, only a little narrowed below, silvery white, slightly tinged with 

 yellow above. Front blue-green, with a little brownish pollen. 

 Antennae (fig. 191a) black, first joint broadly yellow below, being 

 more than half yellow; third joint a little more than twice as long as 

 wide, pointed at tip; arista inserted near the middle of the upper 

 edge. Lateral and inferior orbital cilia whitish, about seven of the 

 upper cilia on each side black. 



Thorax green with blue and bronze reflections; somewhat dulled 

 with gray pollen ; pleurae a little dulled with white pollen. Abdomen 

 green with coppery reflections; the white pollen on its sides abundant 

 and extending upon the dorsum. Hypopygium black; its lamellae 

 of moderate size, somewhat triangular in outline, whitish with a 

 black apical border, jagged and bristly at apex. 



Fore coxae wholly yellow; they appear nearly bare on the anterior 

 surface but have some very minute white hairs. Middle and hind 

 coxae black with yeUow tips, the posterior pair being half yellow. 

 Femora and tibiae yellow. Middle and hind femora each with one 

 preapical bristle, the latter nearly bare below. Posterior tibiae only 

 a little thickened; the glabrous stripe on upper surface distinct and 

 extending inside of the inner row of large bristles, still a little broken 

 by a few hairs. First two joints of fore tarsi wholly pale yellow and, 

 taken together, about as long as their tibiae; the second about two- 

 thirds as long as the first and a very little compressed, its sides being 

 nearly glabrous (last three joints missing in the type). Middle tarsi 

 about one and a half times as long as their tibiae, infuscated from the 

 tip of the first joint, which is without a bristle above, but with 

 several very small ones below and a larger one on posterior surface, 

 the two first joints, taken together, about equal to the tibiae in length. 

 Hind basitarsi yellow, becoming brown or almost black toward its 

 tip, remaining joints black. Calypters and halteres black, the former 

 with black cilia, and a few pale hairs mixed with them, and in certain 

 lights have a yellowish cast. 



Wings (fig. 191) long and a little narrowed; toward their base a 

 little grayish; veins toward the root of the wing yellow; costa with- 

 out enlargement at tip of first vein; last section of fourth vein a 

 little bent near its basal third, beyond this bend nearly straight; 

 third vein bent backward so as to be about half as far from fourth at 

 tip as at the bend; hind margin of wing nearly straight, notched at 

 tip of fifth vein, and widening a little just basally from this notch; 

 there is a very small lobe at tip of sixth vein, partly caused by the 

 wing receding from this point to the anal angle, which is rather 



