"202 the Canadian entomologist. 



other veins bare, first posterior cell open, ending far before the wing-tip, 

 hind crossvein much nearer bend of fourth vein than to small crossvein, 

 this bend angular and without an appendage, costa bare, no costal spine. 

 Type, the following species : 

 Trixodes obesa, new species. 



Dark brown, apex of palpi yellow; vertex of male as wide as either 

 eye, in the female one and one-fourth times as wide, no orbital bristles ; 

 head, except the frontal vitta, thinly grayish pruinose, mesonotum thinly 

 gray pruinose, marked with four black vittse, bristles very short, five pairs 

 of postsutural dorsocentral bristles, abdomen very thinly grayish pruinose, 

 the bristles very short, marginal ones on the third and sometimes on the 

 second segment ; front pulvilli of male rather elongate, but much shorter 

 than the last tarsal joint ; wings hyaline, the base as far as base of discal 

 cell pale brown, crossveins faintly clouded with brown; calypteres brown; 

 length, 1 6 to 19 mm. Two males and two females. 



Habitat. — Sierra Madre, Chihuahua, Mexico (head of Rio Piedras 

 Verdes, September 9th) ; and West Fork Gila River, New Mexico 

 (July 13th). 



Type.— Cat. No. 6300, U. S. N. M. 



Mochlosoma rufipes, new species. 



Black, the antenna?, face, cheeks, palpi, humeri, scutellum, femora 

 and tibne reddish yellow, frontal vitta deep brown, with a tinge of yellow ; 

 vertex as broad as either eye, two pairs of orbital bristles, sides of front 

 and face, except the lower part, densely gray pruinose, upper-inner fourth 

 of face sparsely covered with short bristly hairs, antennae two-fifths as 

 long as the face, the second joint as long as the third, arista long 

 plumose, cheeks three fourths as broad as the eye-height, proboscis 

 setaceous, the portion beyond the articulation twice as long as height of 

 head ; mesonotum gray pruinose and with five blackish vittas, scutellum 

 thinly, abdomen densely, gray pruinose, the latter with dark olivaceous 

 reflecting spots, second and third segments with discal and marginal 

 bristles, the fourth sparsely covered, except on the extreme base ; wings 

 hyaline, the base whitish, bend of fourth vein arcuate, calypteres white ; 

 length, 13 mm. Eight females. 



Habitat. — Sierra Madre, Chihuahua, Mexico (head of Rio Piedras 

 Verdes, about 7,300 feet altitude, September 5th to 1 8th). 



Type.— Cat No. 6301, U. S. N. M. 



