32 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 66 



median stripe, black; hind margins of three apical segments black; 

 hind margins of second to fifth segments narrowly white; hairs of 

 the abdomen black, a few long ones on the sides of first, second, and 

 third segments yellow. Hypopygimn (fig. 20) small, black; its 

 outer lamellae yellow, truncate at tip, fringed with long hairs ; inner 

 appendages black, not conspicuous. 



All coxae yellow, middle and hind ones more or less blackened on 

 outer surface; the hairs and bristles of the coxae are mostly black. 

 All femora and tibiae yellow, posterior pair brown or black at tip. 

 Fore and middle femora with quite long, hind ones with very short 

 yellow hairs below; fore femora with long hairs on the posterior 

 surface, which appear black when seen from above and j^ellow when 

 viewed from below; sometimes the}' are wholly black except the 

 lower row; middle and hind femora with a few black bristle-like 

 hairs near the tip on anterior surface. Fore tarsi yellow with fifth 

 joint black, their joints as 45-17-11-7-7; those of middle tarsi as 

 46-17-15-9-7; hind tarsi yellow, a little darker at tip, their joints as 

 50-20-18-11-8, first joint with two rows of long bristles on the 

 anterior and posterior edges of the lower surface, the longest of 

 which are about as long as the third joint of the tarsi. Calypters 

 and halteres yellow, the former with brown tips and long yellow 

 cilia. 



Wings grayish; third vein only slightly bent backward at tip; 

 last section of fourth vein bent before its middle, parallel with third, 

 ending near the apex of the wing; last section of fifth vein scarcely 

 one and a half times as long as the crossvein. 



Female. — Face not very wide, silvei-y white, suture near apical 

 fourth, palpi yellow with a few black hairs near the tip. Third 

 antennal joint nearly round, still a little pointed at tip. arista sub- 

 apical. Abdomen yellow, a blackish spot at the middle of the 

 dorsum on the first segment; a line on the hind margin of second, 

 third, and fourth and the whole of fifth segment black. Femora, 

 tibiae, and tarsi yellow, tips of middle and hind tarsi darker; pos- 

 terior basitarsus w^ith distinct but minute bristles below. 



Described from 23 males and 3 females. Three males Avere taken 

 at Colden, Erie County,- New York, August 5 and 23 ; one at Ham- 

 burg, Erie County, New York, July 9; one at Delaware Water 

 Gap, New Jersey, July 11; one at Brattleboro, Vermont, July 15; 

 and one at Chester, Massachusetts, July 25 ; two females were taken 

 at Little Valley, New York, July 4 and 18; and one female at Colden, 

 Erie County, New York, July 23. Sixteen males were taken by 

 C. H. Curran at Orillia, Ontario, July 13-18, 1923. 



^2/;->6.— Male, Cat. No. 27048, U.S.N.M., from Colden, New York. 



