THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 295 



base; fourth and fifth joints deep black, of nearly equal length, 

 fourth about as wide as long, fringed above with black hairs wliich 

 are shorter than those on third joint, fifth narrower than fourth, 

 oval, fourth and fifth taken together about equal to third in length. 

 Middle and hind tarsi about one and a half times as long as their 

 tibiae, black from the tip of the first joint. Calypters and halteres 

 yellow, the former with black cilia. 



Wings (fig. 2lQa) grayish, slightly tinged with brown in front; 

 costa with a small elongate enlargement at tip of first vein ; last sec- 

 tion of fourth vein bent at a right angle before its middle, the pos- 

 terior bend with a stump, the anterior bend usually rounded, but 

 sometimes it is also a right angle, rarely there is no stump at either 

 bend; third vein bent backward at tip a very little; hind margin of 

 wing a little indented at tip of fifth vein; anal angle prominent, 

 extending a very httle toward the root of the wing. 



Female. — ^Face wide; fore tarsi plain, black from the middle of the 

 third joint; wing about as in the male, hind femora without cilia. 



Described from many males and females: Grand Island, Erie 

 County, New York, August 7-29; Bufi'alo, New York, September 2 

 (VanDuzee); Battle Creek, Michigan (Aldrich); Fort Erie, Ontario, 

 July 2; Ridgeway, Ontario, July 6-September 6; Montreal, Quebec. 

 August 17. 



This differs from cwprinus Loew in the shorter cilia of the hind 

 femora, and the more compressed and larger third joint of fore tarsi, 

 which is also fringed with longer and denser hairs, the anal angle of 

 the wing is much more prominent in absonus than in cuprinus. 



Type.—M.a\e, Cat. No. 23061, U.S.N.M. 



No. 217. DOLICHOPUS MICROPYGA Wahlberg. 



Dolichopus micropyga Wahlberg, Vet. Akad. Forhandl., 1850, p. 216. — Zetter- 

 STEDT, Dipt. Scand., vol. 11, 1852, p. 4278. 



Two females that may be this species were taken in Colorado by 

 Baker. They are a little longer than the description would call for 

 and the tibiae seem to be a little different color, the four anterior ones 

 being wholly yellowish and the posterior ones almost wholly black, as 

 I understand Zetterstedt the tibiae should all be testaceous or yellow- 

 ish with black tips, stiU in most points they agree with his description. 



They have the face wide, whitish; front shining green; lateral and 

 inferior orbital cilia whitish yellow, about eight of the upper cilia on 

 each side black. Thorax and abdomen green, the former dulled with 

 brownish pollen. Coxae black, anterior pair with black haii*s on the 

 front side; anterior femora black with yellow tips; middle femora 

 yellowish with the lower edge black for two-thirds their length; 

 hind femora yellowish with upper and lower edges black; fore and 

 middle tibiae whoUy yellowish, the former with one bristle below, 

 their bastarei without a bristle above. Middle and hind femora each 



