THE DIPTEROUS GENUS DOLICHOPUS IF NORTH AMERICA. 79 



Type.— Male, Cat. No. 22997, U.S.N.M., from Craig's Mountain. 



The females described above seem to differ from the females which 

 I have placed with D. heatus by their having a bristle on the upper 

 surface of the middle basitarsus, which I can not find in the females 

 placed as those of heatus. 



No. 39. DOLICHOPUS INTENTUS Meiander and Brues. 



Dolichopus intentus Melander and Brues, Biol. Bull., vol. 1, 1900, p. 137, figs. 



• 



Male. — Length 4 mm. ; of wing 3.5 mm. Face moderately narrow, 

 white. Front violet, narrowly green around the edges, shining. 

 Antennae wholly black; third joint three times as long as wide, 

 tapering to a point, the arista inserted just above this point, not 

 much over one-half as long as the third joint. Orbital cilia wholly 

 black. 



Thorax dark green, not very shining; pleurae black with gray 

 pollen. Abdomen dark greenish, almost bronze brown, shining, 

 with but little white pollen on its sides. Hypopygium black; its 

 lamellae (fig. 39) small, blackish, a little paler in the middle, nearly 

 triangular in outline, not jagged or bristly, fringed on apical margin 

 with delicate little brown hairs. 



Coxae blackish; the anterior pair appear to be nearly bare; femora 

 black with yellow tips. Middle femora with one preapical bristle 

 (there may have been two and one have been broken off); hind 

 femora with two preapical bristles, placed one above the other, 

 without cilia below. Tibiae yellow; posterior pair black at tip, the 

 glabrous stripe between the two rows of large bristles on upper sur- 

 face narrow but distinct. Fore tarsi black from the tip of the first 

 joint, not longer than the short fore tibiae; last four joints short, the 

 fourth being slightly shorter than the fifth. Middle tarsi about one 

 and a fourth times as long as their tibiae, black from the tip of the 

 first joint. Hind tarsi wholly black. Calypters and hal teres yellow, 

 the former with black cilia. 



Wings grayish; veins black; costa with a small knotlike enlarge- 

 ment at tip of first vein ; last segment of fourth vein a little bent near 

 its basal third; third vein bent backward a little at tip; hind margin 

 of wing scarcely indented at tip of fifth vein; anal angle rather 

 prominent. 



Redescribed from the single type specimen in the American Museum 

 collection; it was taken at Chicago, Illinois, May 8, 1896. 



No. 40. DOLICHOPUS ANGUSTICORMS, new species. 



Male. — Length 4 mm. ; of wing the same. Face rather wide, sil- 

 very white. Front green, rather thickly covered with gray pollen. 

 Antennae (fig. 40) wholly black, third joint large, nearly four times 



