56 THE CANADIAN ENTOMOLOGIST. 



area below the base of the wing bearing a small black spot, metan- 



otum black. Abdomen black, shining, thinly covered with quite 



long yellow hair, with conspicuous tufts on the sides of the first 



segment, sides of the first and the posterior margins of the second 



and third segments brownish, hypopygium brown, the two large 



rounded glands diverted to the right, with a black, spirally coiled 



"flagellum" below. Legs and halteres light yellow, the long bristles 



at the end of the last tarsal joints four in number, posterior tibiae 



nearly straight, not noticeably thickened and without bristles. 



Wings lofig, narrow, of nearly equal width, grayish hyaline, pos- 

 terior branch of the fifth longitudinal vein scarcely reaching the 

 margin, tegulse yellow. 



Length 8 mm., wing 9 mm. 



Female. — Front narrow below the vertex, gradually widening 

 above the antennae, about four times its width at the vertex. 

 Thorax similar to that of the male except that the pleura are light 

 yellow with small black point below the base of the wing, and 

 black spots between the coxae, disc of the scutellum and the metan- 

 otum blackish. Abdomen dark yellow, with an irregular, broad 

 dorsal line of black constricted at the margins and covering about 

 one-third of each of the first five segments, the fourth and fifth 

 segments also narrowly margined posteriorly with black, sixth 

 and seventh segments and the hook-like ovipositor entirely yellow. 



Length 7.5, wing 8.5 mm. 



Five males amd two females. Holotype, allot^'pe and one 

 paratype, Bretton Woods, N. H., June 25 and 28, 1913 (C. W. 

 Johnson), and one paratype {&), Mt. Washington above Base 

 Station, N. H., July 4, 1914 (C. A. Frost), in the collection of the 

 Boston Society of Natural Histor}^ One paratype (cf) summit of 

 Mt. Washington (Mrs. Slosson) in U. S. National Museum. One 

 paratype (cf ) Bretton Woods, June 28, i^i Museum of Comparative 

 Zoology, and one {&) Mt. Washington above Base Station, July 4, 

 in the author's collection. The specimens collected by Mrs. 

 Slosson and one of those collected by Mr. Frost have the abdomen 

 entirely black. 



