THE DIPTEROUS GENUS DpLICHOPUS IN NORTH AMERICA. 257 



taken together; fourth only slightly shorter than third, fifth a little 

 longer than third and fourth together; first two joints slender, yellow, 

 still with slight whitish reflections ; third and fourth joints compressed 

 and widening from base of third to tip of fourth joint, whitish with 

 distinct silvery reflections; fifth joint black with silvery reflections 

 on outer and yellowish or reddish on inner surface, much compressed 

 and widened, two-thirds as wide as long, somewhat pear-shaped in 

 outline. Middle tarsi one and a fourth times as long as their tibiae, 

 black from the tip of the first joint, still the second and even the third 

 yellowish with only their tips black. Hind tarsi normaUy wholly 

 black, but sometimes the first joint is yellowish at base, which c lor 

 may even extend nearly to its tip, becoming darker and shading into 

 black. Calypters, their cilia and the halteres yellow. 



Wings (fig. 188) grayish; costa with a small elongated enlargement 

 at tip of fifth joint; last section of fourth vein a little bent just 

 beyond its basal third; hind margin of wing a very little indented at 

 tip of fifth vein, a very little flattened from the apex of the wing to 

 tip of fifth vein; anal angle prominent. 



Female. — Face whitish, wide; fore tarsi plain, first joint as long as 

 the two following joints together, third only a little shorter than 

 second, fourth and fifth of equal length; yellowish, becoming darker 

 toward the tip, but only the last joint black; hind femora and tibiae 

 normal; wing without an enlargement of the costa, otherwise about 

 as in the male. 



Redescribed from about 50 males and several females. The col- 

 lection of J. M. Aldrich has specimens from Dover, New Jersey, 

 June 8; Waubamic, Perry Sound, Ontario (Parish) June 11; and, 

 from Franconia, New Hampshire (Mrs. Slosson). I have them from 

 Bratton Woods, New Hampshire, June 30; Lewiston, New York, 

 May 30; Olean, New York, August 5 ; Ottawa, Canada, July 2; and 

 from the foUowing places in Ontario, Canada: Niagara Falls, June 10; 

 Ridgeway, June 6-July 15; Toronto, July 4; Kearney, July 2-8; 

 Danbury, June 16. 



Type. — In Museum of Comparative Zoology, Cambridge, Mass., 

 from New Hampshire. 



No. 189. DOLICHOPUS BATILLIFER Loew. 



DoUchopus hatillifer Loew, Neue Beitr., vol. 8, 1861, p. 19; Mon. N. Amer. 

 Dipt., pt. 2, 1864, p. 45.— Melander and Brues, Biol. Bull., vol. 1, 1900, 

 p. 148. — ^JoHNaoN, Insects of New Jersey, 1909, p. 757. 



Male. — Length, G mm. ; of wing, 5-5.5 mm. Face narrow, golden 

 yellow, a little more Avhitish below. Front green, only slightly dulled 

 with white pollen. Antennae wholly black, or very nearly so; third 

 joint scarcely longer than wide, somewhat conical in outline. Lateral 



