94 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



narrow obscure vittae near median line, and clothed with short 

 suberect hair; scutellum with two pairs of marginals of which the 

 lateral pair is distinctly smaller. Abdomen long and slender, black, 

 densely overlaid with grayish, bronze-tinged pollen to apices of all 

 the segments; first three segments each with a strong median marginal 

 pair of bristles and two to three strong laterals, fourth with the usual 

 uninterrupted marginal row. Male genitalia promment, in repose, 

 extruding from tip of abdomen for distance equal to length of last 

 abdominal segment; first segment subshining black with subapical 

 row of about four bristles; second segment dull reddish, sparsely 

 pollinose, moderately beset with fine black hairs; inner forceps black, 

 much less massive than outer pair, about three times longer than 

 greatest width, tapering abruptly to beyond middle, thence gradually 

 to weak, slender, slightly curved tips, united to beyond middle, tips 

 separated by linear cleft; outer forceps yellow at base, tapering 

 abruptly to near tips, thence expanded into large, polished black, 

 laterally compressed, lanceolate points, when viewed from rear the 

 forceps display an inwardly directed angle near the base beyond which 

 they are strongly bowed; penis slender, black, strongly chitinized to 

 tip, hood in profile triangular with a minute membranous process at 

 posterior angle and a spiniferous pit between the posterior and apical 

 angles; posterior claspers large and bearing a prominent bristle, 

 anterior clasper vestigial; filth sternJte much enlarged and heavily 

 chitinized, punctate, with a broad U-shaped cleft fringed with a 

 row of long hairs terminating at the lateral angle which is produced 

 as a strong black tooth; fourth sternite closing the genital cavity 

 anteriorly and bearing ventrally near the apex, two small combs of 

 short black bristles. Wings hyaline; small costal spine present; 

 third vein bristly about one-half way to small cross vein. Legs 

 black; pulvilli of fore feet as long as last two tarsal joints; middle 

 tibia with usual bristle on outer front side near middle; hind tibia on 

 outside with three unequal bristles of which the most distal, located 

 slightly beyond the middle, is the largest. 



Female. — Not known. 



Length, 7.0 mm. 



Type. — Male, in the Canadian National Collection from Onah, 

 Manitoba, 21-VI-1921 (P. Vroom). 



Host relationsJiips.— Unknown. 



Described from the type, and one other male specimen, Glenboro, 

 Manitoba, 7-VI-1920 (H. A. Robertson), in the Canadian National 

 Collection. 



