THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 133 



edge. Posterior tibiae slightly thickened, narrowly black at tip, and 

 with a brown spot on inner side at basal third. Fore tarsi plain, a 

 little longer than their tibiae, black from the tip of the first joint, 

 which is brownish yeUow and as long as the three succeeding joints 

 taken together; fourth and fifth of nearly equal length. Middle tarsi 

 a little longer than their tibiae, black from the tip of the first joint, 

 which has a large bristle above. Hind tarsi whoUy black. Middle 

 tibiae with a pair of bristles below at apical third and one at basal 

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



. Wings (fig. 87) dark grayish, with a large, brown spot, reaching 

 from opposite the cross-vein to the tip of the third vein and from the 

 costa to just back of the third vein, the other veins also bordered 

 with brown; costa with a small enlargement at tip of first vein; last 

 section of fourth vein a little bent before its middle ; third vein bent 

 backward at tip, but nearly parallel with fourth; hind margin of 

 wing indented at tip of fifth vein; anal angle rather prominent but 

 rounded. 



Described from 2 males from Massachusetts, 1 taken at Sharon, 

 August 9; 1 at Bridgewater, July 11. 



Type. — In the Boston Museum of Natural History. 



No. 88. DOLICHOPUS DORYCERUS Loew. 



Dolichopus dorycerus Loew, Centuries, vol. 1, 1864, p. 85; Mon. N. Amer. Dipt., 

 pt. 2, 1864, p. 326. 



Male. — Length 5.5 mm.; of wing 6.2 mm. Face wide (Loew says 

 that it is more "ochre-brown than ochre-yellow;" my specimen is 

 greasy). Front violet, edged with green. Antennae (fig. 88a) with 

 the first joint and more or less of the second yellow, short but normal ; 

 third black, second and third taken together somewhat orbicular in 

 outline; arista black, slender, tapering, tipped with a somewhat 

 elliptical, almost fusiform lamella. Orbital cilia wholly black. 



Thorax and abdomen green with coppery reflections. Hypopy- 

 gium black; its lamellae of moderate size, somewhat oval in outline, 

 longer than wide, white with a black border, which is wide on apical, 

 narrow on upper margin, jagged and bristly at apex, fringed above 

 with black hairs, below with a few pale ones. 



Fore coxae yellow with a blackish spot at base on outer surface, the 

 anterior side with rather conspicuous black hairs; mixed with these 

 are a few minute yellow ones. Middle and hind coxae black, the 

 former with extreme tips and trochanters yellow, posterior trochan- 

 ters blackish. Femora and tibiae yellow. Middle and hind femora 

 each with one preapical bristle (Loew states there are usually two 

 preapical bristles on hind femora), the latter not ciliated below. 

 Posterior tibiae scarcely thickened; on their inner surface near basal 



