THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 165 



Fore coxae yellow, their anterior surface covered with little black 

 hairs. Middle and hind coxae black on outer side, yellow on inner 

 surface and at tip. Femora and tibae yellow. Middle and hind 

 femora each with one preapical bristle, the latter ciliated with long 

 stiff black hairs on lower inner edge, these hairs inserted at nearly 

 equal distances, but rather far apart, the longest hairs longer than the 

 width of the femora. Posterior tibiae a little thickened, black at tip 

 for one-fifth their length, their inner siu-face with a wide apparently 

 glabrous stripe, which is narrowed apically, and is in reality covered 

 with very minute black hairs. Fore and middle tarsi about one and a 

 fourth times as long as their tibiae, infuscated from the tip of the first 

 joint, which is about equal to the two following joints taken together, 

 fourth and fifth joints of nearly equal length. Hind tarsi one and a 

 third times as long as their tibiae, wholly black. Calypters and hal- 

 teres yellow, the former with black cilia. 



Wings (fig. 114) grayish; costa with a very slight enlargement at 

 tip of first vein; last section of foiuth vein sharply bent at nearly a 

 right angle near its middle and with a stump of a vein at the pos- 

 terior or first bend; hind margin of wing a little indented at tip of 

 fifth vein; anal angle rather prominent but rounded. 



Female. — Face wide, more grayish than in the male; third antennal 

 joint about as long as wide; hind femora with a row of stiff black hairs 

 on lower inner edge, the longest of which are about one-fifth as long 

 as the width of the femora and might almost be called cilia; hind 

 tibiae without the apparently glabrous stripe on inner surface; costa 

 without an enlargement; otherwise about as in the male. Middle 

 tibiae with three bristles below, one pair at apical third and one bristle 

 at basal third, their basitarsi without a bristle above. 



Redescribed from 1 female from the type material; it was taken at 

 Philadelphia, Pennsylvania, May 30; also from 1 female from 

 Lawrence, Kansas; 1 female and 2 males from Columbus, Ohio, May 

 10; 1 male taken at Buffalo, New York, June 24; 1 male at Boon ton. 

 New Jersey, June 2; 2 males at Lafa^^ette, Indiana, June 4; 2 males at 

 Algonquin, Illinois; 1 male taken at Jacksonville, Florida, by Mrs. 

 Slosson; 1 male from Plummer's Island, Maryland, June 5, by W. V. 

 Warner; and 2 males taken at Washington, District of Columbia, 

 August 13, 1917, by A. L. Melander. 



No. 115. DOLICHOPUS ALBICOXA Aldrich. 



Dolichopus alhicoxa Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 10, pi. l,fig. 

 13. — ^Johnson, Insects of New Jersey, 1909, p. 756. 



Male. — ^Length 4-4.5 mm.; of wing 4 mm. Face rather wide, sil- 

 very white. Front shining green. Antennae black; first joint yellow 

 on the lower edge; third joint scarcely longer than wide, obtusely 

 pointed at tip. Lateral and inferior orbital cilia whitish. Palpi 

 yellow. 



