THE DIPTEKOUS GENUS DOLICHOPUS IN NORTH AMERICA. 97 



before the other. Tibiae yellow; posterior pair black at tip for one- 

 sixth their length, a little stouter than the others, slightly swollen 

 below before their middle, at which point there is a brown spot on 

 inner surface; the glabrous stripe between the large bristles not well 

 marked, but just inside of the inner row of bristles is a narrow glab- 

 rous stripe extending three-fourths their length and expanding to 

 include the brown spot mentioned above; bristles of the tibiae rather 

 short. Fore tarsi about as long as their tibiae, their joints of decreas- 

 ing length, yellowish, a little darker toward their tips. Middle 

 tarsi (fig. 54c) one and a half times as long as their tibiae (fig. 5ih), 

 black from the tip of the first joint; second, third, and fourth joints 

 each a little shorter than the one preceding it, fourth a little com- 

 pressed, widest in the middle; fifth joint short, about one-half as 

 long as the fourth. Hind tarsi one and one-third times as long as 

 their tibiae, deep black. Calypters and halteres yellow, cilia of the 

 former black. 



Wings (fig. 54) grayish, very slightly tinged with brown in front 

 of third vein; of somewhat equal width; costa with a small knot- 

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

 little bent just before basal third; hind margin of wing scarcely in- 

 dented at tip of fifth vein, anal angle prominent. 



Female. — Face wide, grayish white; third antenna! joint a little 

 longer than wide, pointed at tip, rather large for a female; fore and 

 middle femora black with their tips rather broadly yell(>w: middle 

 tibiae and tarsi black, the former with one large and one small 

 bristle below, the latter a little longer than their tibiae; first joint 

 about as long as the three succeeding joints taken together and 

 without a bristle above; fore tarsi mostly blackish; bend in last sec- 

 tion of fourth vein at its basal third, being a little farther from the 

 cross- vein than in "the male; wings more broadly rounded on hind 

 margin than in the male and more strongly tinged with brown in 

 front of third vein; costa without an enlargement at tip of first vein. 



Described from 4 males and 5 females. One male was taken at 

 Algonquin, Illinois (Nason); 1 at Ithaca, New York; 1 at Portage, 

 New York, July 1; and 1 at Toronto, Ontario, July 4. One female 

 was taken at Gowanda, New York, June 7; 1 at East Aurora, New 

 York, June 9; 2 at Protection, New York, June 16; and 1 at Ridge- 

 way, Ontario, July 15. 



Type.—Male, Cat. No. 23003, U.S.N.M., from Ithaca, New York. 



This species is very much like incongruus Wheeler, having the same 

 large and elongated third an tennal joint. The legs of the two species 

 are colored alike and both have the same small lamellae which are 

 shaped and colored about alike, they also have the bend in the last 

 section of fourth vein at or just before its basal third; but this species 



