THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 245 



and is continued to the tip by a very narrow line just inside of the 

 inner row of large bristles. Fore tarsi more than one and a half 

 times as long as their tibiae, the first two joints being nearly as long 

 as the tibia, first three joints yellow, still sometimes a very little 

 infuscated from the tip of first joint, fourth and base of fifth black 

 or blackish, fifth decidedly yellowish on apical half, shorter than 

 fourth. Middle tarsi about one and a fourth times as long as their 

 tibiae, infuscated from the tip of the first joint, still often quite yellow 

 to the tip of the third joint; first joint with a bristle beyond the 

 middle of its upper side, theh tibiae with three bristles below, one 

 pair at apical third and one bristle at basal thhd. Hind tarsi nearly 

 one and one-third times as long as their tibiae, colored like the middle 

 ones. Calypters and halteres yellow, the former with black cilia. 



Wings (fig. 179) grayish, sometimes slightly tinged with yellowish 

 brown In front; costa yellowish on inner edge, with a slight enlarge- 

 ment at tip of first vein, which is yellowish and usually has a brown 

 spot on its surface; last section of fourth vein a little bent near its 

 basal thhd, sometimes this bend is very small, leaving this section of 

 fourth vein nearly straight and almost parallel with third vein; usu- 

 ally the bend is more conspicuous. Hind margin of wing only slightly 

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

 being broadly rounded, not prominent. 



Female.— Fsice a little wider than in the male; fore coxae usually 

 with more black hairs on inner edge; fore tarsi about one and a fourth 

 times as long as their tibiae, colored as in the male, except that the 

 fifth joint does not seem to be any paler toward its tip, but it is 

 shorter than the fourth; second joint about two-thirds as long as the 

 first, being shorter in proportion than in the male; posterior tibiae 

 without a glabrous stripe on inner side; hind femora without ciUa, 

 but have a row of small delicate yellow hairs on then- lower inner 

 edge, which are quite easily seen; wings without the enlargement at 

 tip of first vein, otherwise they are about as in the male. 



Redescribed from many specimens from the following locations: 

 Pittsburgh, Pennsylvania, June 3; Lafayette, Indiana (Aldrich), July 

 6; Knoxville, Tennessee, May 19 (Summers); LawTence, Kansas (Al- 

 drich); Washington, District of Columbia, June; Dallas, Texas, May 

 31; Western New York, June 22-September 2; Fort Erie, Ontario, 



July 2. ■ ^ . ^„. . . 



Type localities.— W&shmgion, District of Columbia; Illinois, and 

 Middle States. Aldrich reports it from Kansas, Pennsylvania, and 

 Ohio; Melander and Brues from Wisconsin; Johnson, Insects of New 

 Jersey, from lona. New Jersey, September 12. 



Type.— In Museum of Comparative Zoology, Cambridge, Massa- 

 chusetts. 



