THE DIPTEROUS GENUS DOLICHOPUS IN J^ORTH AMERICA, 231 

 No. 167. DOLICHOPUS CHRYSOSTOMA Loew. 



Dolichopus chrysostoma Loew, Mon. N. Amer. Dipt., pt. 2, 1864, p. 67. 



Male. — Length 3-4 mm. ; of wing 3.5 mm. Face narrow, yellowish 

 white, in the type darker, almost golden yellow. Front shining 

 green. Antennae (fig. 167) wholly black, third joint about twice 

 as long as wide, with an acute point at tip, arista inserted at middle 

 of third joint. Lower orbital cilia pale, a few of the upper cilia 

 black. 



Thorax green with a coppery spot on each side of the dorsum in 

 front of the transverse suture; front slope of the dorsum with a little 

 white pollen. Abdomen dark green or blackish green, with coppery 

 reflections. Hypopygium black; its lamellae of moderate size, 

 somewhat orbicular in outline, or perhaps they might be called 

 triangular with rounded apex; whitish with wide black border on 

 the margin of their apical half, a little jagged and bristly at apex. 



Fore coxae yellow, a little infuscated at extreme base, with minute 

 black hairs on the anterior surface. Middle and hind coxae black 

 with yellow tips, posterior pair mostly yellow except on outer surface. 

 Femora and tibiae yellow. Middle and hind femora with one pre- 

 apical bristle, the latter without cilia below, still with a fringe of 

 minute yellow hairs on lower inner edge. Posterior tibiae with the 

 usual glabrous stripe on upper surface very indistinct and narrow. 

 Fore tarsi scarely one and a fourth times as long as their tibiae, 

 yellow, only a little infuscated at tip. Middle tarsi fully one and a 

 fourth times as long as their tibiae; first two joints yellowish with 

 brown tips, remaining joints dark brown, still the base of the third 

 paler. Hind tarsi blackish from the tip of the first joint, which is 

 mostly pale yellow, still the base of the second is quite yellowish. 

 Calypters and halteres yellow, the former with black cilia. 



Wings grayish; of rather equal width; costa scarcely enlarged at 

 tip of first vein; last section of fourth vein a little bent at a point 

 slightly beyond its basal third; tips of third and fourth veins rather 

 widely separated, still the third bent backward; hind margin of wing 

 not indented at tip of fifth vein; anal angle prominent. 



Redescribed from the type specimen, and 1 male in the United 

 States National Museum collection, taken at Beverly, Massachusetts, 

 July 21, 1869. 



Type locality. — -Washington, District of Columbia. 



No. 168. DOLICHOPUS PARVICORNIS, new species. 



Male. — Length 3 mm.; of wing 2.5 mm. Face moderately wide, 

 silvery white. Front shining blue green. Antennae wholly black, 

 or possibly a little yellowish on lower edge; third joint a little longer 

 than wide, oval, rounded at tip, lateral and inferior orbital cilia 

 yellowish white, about five of the upper cilia on each side black. 



