THE DIPTEEOUS GENUS DOLICHOPUS IN NORTH AMERICA. Ill 



spots of white pollen on the sides of the segments and narrow black 

 incisures. Hypopygium black; its lamellae of moderate size, some- 

 what oval in outline but narrowed into the stem and quite pointed 

 at tip, whitish or yellowish with a narrow brown border and fringed 

 with brown hairs ; the hook-shaped inner appendages are prominent, 

 yellow, and nearly as long as the lamellae. 



Fore coxae yellow in front for more than half their length, black 

 at base, the front surface with black hairs, but with these are many 

 delicate yellow ones. Middle and hind coxae black with yellow 

 tips. Fore and middle femora yellow, the latter with a black line 

 at base below, and a small black spot above. Hind femora black 

 with extreme tips yellow, ciliated on lower inner edge with black 

 hail's, which are about half as long as the width of the femora. 

 Middle and hind femora each with one preapical bristle. Fore and 

 middle tibiae yellow; hind tibiae black, thickened, with an elongated 

 spot of yellowish pollen on inner surface. Fore tarsi yellow at 

 base, blackened from the tip of the second joint, about one and a 

 fourth times as long as their tibiae, first joint as long as the re- 

 maining four taken together, third about three-fom'ths as long as 

 second, last thi-ee joints a very little flattened. Middle tarsi about 

 the length of their tibiae, black from the tip of the first joint. Hind 

 tarsi wholly black. Calypters and halteres yellow, the former with 

 black cilia. 



Wings (fig. 76) gray, brownish in front of the third vein; costa a 

 little enlarged at tip of first vein, gradully tapering toward the tip; 

 last section of fourth vein only a little bent just before its middle; 

 third vein bent backward before the tip so that the tips of third 

 and fourth veins are rather close together; liind margin of wing 

 scarcely indented at tip of fifth vein; anal angle prominent; wings of 

 rather equal width. 



Female. — Face not very wide for a female, white; fore tarsi plain, 

 black from the tip of the second joint; sometimes only the last two 

 joints are black; hind tibiae thick for a female, black, with one 

 bristle below, their basitarsi without a bristle above; anal angle of 

 wing not as prominent as in the male. 



Described from 6 specimens. One pair taken at Beltsville, 

 Maryland, June 9, 1915, by W. L. McAtee; 1 male from the same 

 location taken by N. Banks; 1 male taken at Fall River, Massa- 

 chusetts, June 8, 1909, by N. S. Easton; 1 male at Acto, New Jersey, 

 June 15, 1893; 1 male at Barcroft, Virginia, June 7, 1912; and 1 

 female taken by me at Kearney, Ontario, July 9, 1909. 



r?/2)e.— Male, Cat. No. 23012, U.S.N.M., from Beltsville, Mary- 

 land. 



