418 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



first vein on costa, third vein bristly to fork, which is at about its mid- 

 dle, fourth vein rather sharply curved at its base, straight elsewhere, 

 ending well before wing tip, seventh very distinct at base but not 

 reacliing margin of wing; halteres black. 



Length, 2-3 mm. 



Described by Brues ^ from two specimens from Pullman, Washing- 

 ton, and Moscow, Idaho. Unrepresented in collection. 



TRUPHEONEURA PACHYNEURA Loew. 



Male and female. — Black, distintly shining; frons in male very 

 short, about one-third as long as broad, in female nearly one-half as 

 long as broad, frontal bristles longer in male than in female, tliird 

 antennal joint in male very large, round, and strongly pubescent, in 

 female normal in size and not so distinctly pubescent, arista longer 

 than breadth of frons and pubescent in both sexes, palpi black, in 

 male broad and leaf-like with very weak bristles, in female narrow, 

 and normally bristled, female proboscis very large, exserted, longer 

 than palpi; thorax shining black, scutellum with four subequal bris- 

 tles, abdomen opaque black, second and sixth segments elongated in 

 both sexes, posterior margin of sixth segment w^th long and posterior 

 margins and sides of other segments with distinct, though not ])ar- 

 ticularly long hairs, male hypopygium very large, exserted, glossy 

 black at base and extreme tips of lamellae, forceps-like lamellae nearly 

 symmetrical, anal protuberance small, brown, some long hairs on 

 extremity of hypopygium; legs piceous, very strong, the fore tarsi 

 in both sexes distinctly thickened, hardly longer than tibiae, fore 

 tibial bristle weak or absent, mid tibial bristles present on basal 

 third, hind tibiae without any bristle on basal half; wings grayish, 

 costa to beyond middle in both sexes, increasing much in thickness 

 from end of first vein to tip, first division as long as other two in both 

 sexes, third two-thirds as long as second, fringe very short and fine, 

 third vein very thick and black, as thick on its whole length as costa 

 at thickest part, fourth vein leaving third at one-third beyond fork 

 with a distinct bend, more pronounced in female, and ending slightly 

 recurved at as much in front of wing tip as fifth does behind it, sev- 

 enth vein reaching two-thirds of the length to wing margin; halteres 

 black. 



Length, 2^-4 mm. 



I have examined specimens in C. W, Johnson's collection from 

 Moscow, Idaho; Olympia and Seattle, Washington; and Montreal, 

 Quebec. A very distinct species, and easily kno\vn by the very 

 thick third vein. I have redescribed this species, as so many impor- 

 tant characters were not given in Loew's original description and 

 Brues's paper on the group. 



ijourn. N. Y. Ent. Soc, vol. 16, 1908, p. 200. 



