260 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



No. 190. DOLICHOPUS TENER Loew. 



DoUchopus tener LoBW, Neue Beitr., vol. 8, 1861, p. 17; Mon. N. Amer. Dipt., 

 pt. 2, 1864, p. 49. — Melander and Brues, Biol. Bull., vol. 1, p. 148. 



Male. — Length 4-5 mm.; of wing 3.5-5 mm. Face rather narrow, 

 pale yellow. Front shining green, but in certain lights appearing to 

 be covered with gray pollen which nearly conceals the ground color. 

 Antennae yellow, third joint a little longer than wide, pointed at tip, 

 usually a little blackened there. Lateral and inferior orbital cilia 

 pale yellow, only three or four of the upper cilia on each side black. 



Thorax light green; dorsum dulled with gray pollen; in my speci- 

 mens there are two narrow coppery lines in the center with a narrow 

 green line between them ; pleurae dulled with white pollen. Abdomen 

 green with coppery reflections; the lower edges of the dorsum with 

 white pollen and long yellow hairs, which are longest on the second 

 segment. Hypopygium black; its lamellae of moderate size, some- 

 what round in outline, white with very narrow black border on 

 apical and upper margins, jagged and bristly at apex, fringed above 

 with black hairs. 



Coxae yellow; anterior surface of fore coxae with silvery pollen 

 and minute white hairs; middle pair with a small brown spot on 

 outer surface, femora and tibiae yellow. Middle and hind femora 

 «ach with one preapical bristle, the latter ciliated on lower inner 

 edge with from six to ten delicate yellow hairs, the longest of which 

 is longer than the width of the femora, and near its middle. Middle 

 tibiae with one small bristle below, their basitarsi without a bristle 

 above. Posterior tibiae only slightly thickened; the usual glabrous 

 stripe on upper surface extending from the base to apical third. 

 Fore tarsi (fig. 190a) nearly twice as long as their tibiae, second 

 joint three-fourths to four-fifths as long as first, third three-fourths 

 to fully as long as second, fourth and fifth of nearly equal length, 

 each about one-third or less than one-third as long as third; first 

 four joints very slender, yellow, fourth a very little widened at tip; 

 fifth black, compressed, oval, but straight below, not as wide as 

 long. Middle tarsi nearly one and a half times as long as their tibiae, 

 infuscated from the tip of the first joint. Calypters, their cilia, and 

 the halteres yellow. 



Wings (fig. 190) grayish; veins yellowish; costa with a small 

 elongated enlargement at tip of first vein ; last section of fourth vein 

 moderately bent before its middle; hind margin of wing scai'cely 

 indented at tip of fifth vein, rather evenly rounded, the anal angle 

 being rounded off, nearly obsolete. 



Redescribed from 4 males which I took on Grand Island, Erie 

 County, New York, August 17, 1913, and August 18, 1917. 



Type locality. — Chicago, Illinois; Melander and Brues report it 

 from Wisconsin. 



