160 BULLETIN IIG, UNITED STATES NATIONAL MUSEUM. 



No. 110, DOLICHOPUS COMPTUS, new species. 



Male. — Length, 5 mm.; of wing the same. Face wide, covered 

 with yellowish gray pollen. Front blue-green with a little yellowish 

 pollen along the orbits. Antennae (fig. 110a) yellow; third joint 

 nearly orbicular in outline, its apical half blackish; arista inserted 

 in a notch on upper edge of third joint, black, the tip with a fusiform 

 enlargement, which is about oiio-third of the length of arista and is 

 fringed on both upper and lower edges with minute hairs; this 

 enlarged tip forms a distinct joint to the arista; proboscis blackish; 

 palpi yellow. liateral and inferior orbital cilia pale yellow, about 

 eight of the upper cilia on each side black. 



Thorax green with coppery reflections and a little yellowish pollen 

 on the anterior part of the dorsum; pleurae dulled with white pollen. 

 Abdomen green with slight bronze reflections. Hypopygium black, 

 short; its lamellae smah, somewhat oval in outline, but tapering into 

 the stem, about one and a fourth times as long as wide, yellowish 

 with a black border on the rounded apical margin, which is a little 

 jagged and bristly at its upper corner, otherwise fringed with black 

 hairs. 



Fore coxae 3^eilow, with only a trace of brown at base on outer side, 

 their anterior surface clothed with stift' black hairs, except at base 

 on outer edge where there are a few paie hairs. Middle and hind 

 coxae black with yellow tips. Ail trochanters with a small brown 

 spot below. Femora and tibiae yellow. Middle and hind femora 

 each with one preapical bristle, the latter without cilia below, the 

 little black hairs on their sides reaching the lower edge. Fore 

 tibiae slightly, the middle and hind ones conspicuously brown at tip. 

 Middle tibiae also with a faint brownish ring near apical third and 

 with a narrow glabrous line on upper surface, which expands a little 

 beyond the brown ring, so as to form a small glabrous spot. Pos- 

 terior pair thickened; the glabrous stripe on upper surface distinct, 

 but it does not reach either base or tip. All tarsi wholly black, 

 except the first joint of fore tarsi, wnich is yellowish below. Fore 

 and middle tarsi stout, very slightly compressed, a little longer than 

 their tibiae, the first joint being about as long as the three suc- 

 ceeding joints taken together; middle basitarsi without a bristle 

 above. Calypters and halteres yehow, the former with black cilia. 



Wings (fig. 110) grayish, very slightly darker in front of second 

 vein; costa not enlarged at tip of first vein; last section of fourth 

 vein bent before its middle; third vein bent backward a little to^ 

 ward its tip; hind margin of wing a little indented at tip of fifth 

 vein; the wing widest just back of this point; wing with a large lobe 

 from the tip of sixth vein to the anal angle. 



Described from 1 male taken at Tallac Lake, Tahoe, California, 

 July 3, 1915, by E. P. Van Duzee. 



