NORTH AMERICAN DIPTERA. 103 



• 



slender, not thickened at tij), quite bristly. Thorax same width as 

 head; scutelluni with an apical decussate pair of niacrochjetje reach- 

 ing nearly to base of third abdominal segment, and three lateral and 

 a discal pair of weaker ones. Abdomen as wide as thorax, elongate- 

 oval, first segment not shortened, macrochaeta? only marginal; hy[)o- 

 pygium exserted, basal segments bearing macrochietse. Legs rather 

 long, moderately stout, somewhat bristly, metatarsi about one-half 

 as long as following joints together; claws and pulvilli of male elon- 

 gate. Wings longer than abdomen, with small costal spine, third 

 vein bristly at base; apical cell opened a little before tip of w^ing; 

 fourth vein bent at an obtuse angle, with a very slight w'rinkle at 

 bend, apical cross-vein bowed in, hind cross-vein sinuate, much 

 nearer to bend of fourth vein. Type, T. distinda n. sp. 



Trixoelista distincta u. sp. -^ .— Eyes light brown, frontal vitta black- 

 ish, sides of front, face and cheeks black, lightly silvery pollinose, hardly show- 

 ing in some lights ; antennae and arista brown, first two antennal joints slightly 

 rufoHs; proboscis black, palpi brownish yellow, black-bristly; occiput cinereous, 

 black-hairy. Thorax and scutellum silvery, with three heavy black vittse, the 

 median one continued on to the scutellum, the outer ones reaching scutellum. 

 Abdomen blackish, silvery pollinose, leaving a median vitta and a lateral trian- 

 gular marking of black on segments one to three, first segment with a lateral 

 pair of macrochwtfe, second with a lateral pair and a median marginal pair, 

 third with about twelve marginal, and anal with about ten marginal macro- 

 chsetse, the whole abdomen also with long bristly hairs. Legs black, femora and 

 tibiae somewhat bristly; claws and pulvilli elongate, the pulvilli rather broad, 

 yellowish smoky. Wings grayish hyaline, slightly pale tawny at base, tegulse 

 pearl whitish, with a slight tawny tinge, halteres brownish, lighter at base. 

 Length of body 9 mm. ; of wing 7.5 mm. 



Described from one specimen; Carlinville, III. ( Chas. Robertson) 



L,A€H]VO.^IIVIA n. gen. 

 Medium sized to rather small, cinereous and blackish species, with 

 considerably the facies of Atrophopoda and Vandenmilpia, but readily 

 distinguished from these by the thickly hairy eyes and the character 

 of the front claws and j)ulvilli, and considerably approaching Hy- 

 pertrophocera in the character of the antennae. Belongs in the 

 Tachininse. Head triangular in profile, the oral profile short, front 

 less than one-third width of head at vertex in % , fully one-third in 

 9 , much wider before in both sexes, face about three-fiftiis width of 

 head, frontal bristles in a single row descending on sides of face as 

 low or lower than lower border of eyes, stout, the strongest and 

 longest being the vertical and the lowest descending bristles, the 

 vertical and next pair directed backward, the descending bristles 



TRANS. AM. ENT. SOC. XIX. MAY. 1892. 



