THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 217 



black hairs and at other times only a few yellow ones. Middle and 

 hind coxae yellow, more or less blackened on outer surface. Femora 

 and tibiae yellow. Middle and hind femora each with one preapical 

 bristle, the latter without cilia, but with a row of minute pale hairs 

 on lower inner edge. Posterior tibiae thickened, slightly more so 

 beyond the middle, often darkened on inner side at tip. Fore tarsi 

 (fig. 156) one and a half times as long as their tibiae, first two joints 

 nearly as long as the tibia, slender, a little infuscated, second joint 

 nearly as long as the first, third and fourth infuscated, third one- 

 third as long as second, a little widened at tip, fourth a little more 

 than half as long as third, as wide as long; fifth joint black, much 

 compressed, nearly as wide as long, three-fourths as long as second, 

 somewhat round in outline with a rounded emargination on apical 

 margin below its middle, forming two lobes, the upper of which is 

 much the largest. Middle tarsi one and a fourth times as long as 

 their tibiae, black from the tip of the first joint, which has a large 

 bristle above near apical third. Calypters and halteres yellow, the 

 forrner with black cilia. 



Wings gray, tinged with yellowish brown on front half; costa 

 distinctly enlarged at tip of first vein, tapering to its tip ; last section 

 of fourth vein a little bent before its middle; hind margin of wing 

 only slightly indented at tip of fifth vein, with a very prominent 

 lobe at tip of sixth vein and another equally prominent at anal 

 angle. 



Female.— Face wide, gray; first antenna! joint yellow, second and 

 third black; fore tarsi plain, first joint slightly longer than the three 

 following joints together, second scarcely half as long as first, fifth 

 as long as third, fourth distinctly shorter, fore coxae with black 

 hairs on the lower half of anterior surface; costa without enlargement, 

 hind margin of wing without any trace of a lobe, anal angle promi- 

 nent. 



Described from 18 males and 1 female. Eight males were taken 

 at Battle Creek, Michigan (Aldrich), 1 at Elm Grove, Wisconsin, 

 July 4; 1 at Elba, New York, June 25; 2 at East Aurora, New York, 

 June 15; 3, and 1 female at Three Forks, Montana, August, 1; 2 at 

 Kearney, Ontario, July 7 and 28; 1 at Kukak Bay, Alaska, July 4, 



Type.— Kale, Cat. No. 23045, U.S.N.M., from East Aurora, New 

 York. 



Allotype in the collection of A. L. Melander taken at Three Forks, 

 Montana. 



No. 157. DOLICHOPUS AMPHERICUS Melander and Brues. 



Dolichopus amphericus Mel A}!}DEH and Brues, Biol. Bull., vol. 1, 1900,p.l46, fig. 



Male. — Length 6 mm.; of wing 4.5 mm. Face wide, dark golden 

 yellow. Front green. First antennal joint wholly yellow; second 



