NO. 1934. NEW AMERICAN PIPVNCULID^—MALLOCH. 299 



thorax shining black, the usual hairs very indistinct, pleurae gray- 

 dusted, scutellum with distinct pale pubescence, longest and most 

 distinct on posterior margin; abdomen shining black, broader 

 toward apex, first segment very short, dorsally only one-fourth as 

 long as second, silvered on lateral margins, lateral comb pale, all 

 segments, but especially the fourth and fifth, with scattered short 

 hairs which are most distinct on sides, hypopygium short, sym- 

 metrical, with a large central depression, ventral process exposed, 

 yellow; legs yellow, femora black except at extreme apex, all tibiae 

 with a ring-like mark on middle which does not extend completely 

 over dorsal surface, and extends to about one-third the length of 

 tibiae, all tibiae with distinct, short, pale pubescence, especially 

 noticeable on hind pair which are rather bent, hind femora with 

 only a few pale short hairs, no noticeable bristles anywhere; wings 

 clear, small cross vein before the end of auxiliary vein, and at about 

 one-seventh from base of discal cell, outer cross vein nearly its own 

 length from end of fifth vein ; halteres yellow except at extreme base. 



Length, 3^ mm. 



Two males, Kaslo, British Columbia, July 16, 1903 (A. N. Caudell). 



Near to favomaculatus Hough, but the abdomen is not anywhere 

 yellow as in that species. Easily separated from any of the other 

 species in the suhvirescens group by its neuration, the imier cross 

 vein being very near to the base of the discal cell. 



lype.—C&t. No. 14805, U.S.N.M. 



