THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 47 



hind margin of wing scarcely indented at tip of fifth vein and nearly 

 evenly rounded, the anal angle not being much developed. 



Female. — The above description is true of the female in all points 

 outside of the hypopygium, except that the costa has no enlargement 

 at tip of first vein and the hind tibiae are scarcely at all thickened, 

 they are not very much so in the male. The face is the same width 

 as in the male and has the same silvery pollen. 



Described from 5 males and 12 females taken by J. M. Aldrich, 

 Hazen, Nevada, July 13, both at shore of Soda Lakes and at fresh- 

 water seepage near by; Market Lake, Idaho, and Longmire's Springs, 

 Mount Rainier, Washington, Aug. 2. There is 1 pair from Colorado 

 in the United States National Museum, collector unknown. 



Type and allotype from Colorado and in the United States National 

 Museum. 



ri/2)g.— Male, Cat. No. 22983, U.S.N.M. 



No. 10. DOLICHOPUS OVATUS Loew. 



Dolichopus ovatus, Loew, Neue Beitr., vol. 8, 1861, p. 13; Mon. of N. Amer. 

 Diptera, pt. 2, 1864, p. 35.— Osten Sacken, Cat. of N. Amer. Diptera, 1878, 

 p. 108. 



Male. — Length 4 mm.; of wing the same. Face very narrow, 

 silvery white. Front rather narrow, shining green. Antennae 

 (fig. 10a) wholly black; third joint nearly orbicular in outline, a 

 little pointed at tip, lateral and inferior orbital cilia white, the black 

 cilia descending about one-third the eye height. 



Thorax dark shining green with slight bronze reflections on the 

 anterior edge of the dorsum; pleurae dulled with whitish pollen. 



Abdomen green with coppery reflections. Hypopygium black; its 

 lamellae (fig. 10) rather small, somewhat triangular in outline, but 

 rounded on upper corner; white with a narrow black border on 

 apical margin, jagged and bristly on the lower corner, otherwise the 

 outer margin is fringed with little dark hairs. 



Coxae, legs, and feet black; knees, tips of fore and middle coxae 

 and extreme bases of fore and middle basitarsi yellowish. Fore 

 coxae with white pollen and minute black hairs on the anterior sur- 

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

 latter without cilia below. Hind tibiae scarcely thicker than the 

 others, the glabrous stripe on their upper surface can be seen as a 

 shining line between the rows of large bristles. Fore tarsi scarcely 

 as long as their tibiae, the first joint being as long as the remainmg 

 four taken together, third and fourth joints scarcely as long as broad. 

 Middle and hind tarsi slightly longer than their tibiae. Calypters 

 and halteres yellow, the former with black cilia. 



Wings a little grayish; costa not thickened at tip of first vein; 

 bend in last section of fourth vein just beyond its basal third; hind 



