THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 77 



blackish, dulled with gray pollen. Abdomen green with black 

 incisures and coppery reflections on the posterior margins of the seg- 

 ments. H3^popygium black; its lamellae (fig. 37) moderately large, 

 somewhat triangular in outline, yellowish with long, black, bushy, 

 very dense hair on apical portion and short black hairs on the whole 

 outer surface, not at all jagged on apical margin. 



Coxae and femora black, their tips and the trochanters yellowish. 

 Fore coxae with black hairs on anterior surface, the usual bristles 

 at tip. Middle and hind femora each with one preapical bristle, the 

 latter not ciliate but fringed on lower outer edge with delicate little 

 black hairs. Tibiae yellow: posterior pair rather stout, black at tip 

 for one-fifth their length, the glabrous stripe on upper surface distinct 

 and reaching the entire 1-ength. Fore tarsi about as long as their 

 tibiae, brownish yellow, first joint a little shorter than the remaining 

 four taken together, second joint very little longer than third, last 

 three joints of nearl}^ equal length, still the fourth a little the shortest. 

 Middle tarsi slightlj^ longer than their tibiae, infuscated from the tip 

 of the first joint, but scarcely black. Hind tarsi wholly black. 

 Calypters and halteres yellow, the former with black cilia. 

 , Wings grayish; costa not at all enlarged at tip of first vein; last 

 section of fourth vein bent at its middle; hind margin of wing 

 scarcely indented at tip of fifth vein; anal angle rounded, not 

 prominent. 



Female. — Agrees with the description of the male given above, 

 except that the face is as wide as the front and is more grayish white; 

 the hind tibiae have more black at their tips but it is less sharply 

 defined and the wings are a little tinged with j^ellowish brown in 

 front of the third vein. The delicate hair^ on lower outer edge of 

 hind femora are smaller than in the male. Middle tibiae with one 

 bristle below, their basitarsi without a bristle above. 



Described from 9 males and 4 females. Two males are in the 

 collection of J. M. Aldrich; 1 male was taken at Montreal Island, 

 Quebec, and 1^ at Toronto, Ontario, May 23, 1896. One female was 

 taken at Ottawa, Canada, July 2, 1912, by G. Beaulieu; 1 female at 

 Summerside, Prince Edward Island, July 21, 1914, by Dr. E. M- 

 Walker. I took the other specimens at Toronto, Ontario, July 4, 

 1911, and July 21, 1918. 



Type.— Male, Cat. No. 22996, U.S.N.M., from Toronto. July 21, 

 1918. 



No. 38. DOLICHOPUS BISETOSUS, new species. 



Male.— Length 4-5 mm.; of wing 4-4.25 mm. Face rather wide, 



white, a little tinged with gray or yellowisli gray. Front shining 



green with more or less distinct violet reflections. Proboscis, palpi, 



and their hairs black. Orbital cilia wholly black. Antennae (fig 



187329—21 6 



