\v;LLisrON: new DiprERA. 75 



thickened than the otliers. Wings hyaline, the outer end and the 

 posterior cells lightly infuscated; both branches of the third vein 

 sinuous, the first posterior cell not wider at the distal end than is the 

 second submarginal cell. 



Length, 15-1 7 mm. 



Numerous specimens, Georgia, North Carolina, Michigan, South 

 Dakota, New England. 



Asilus (Tolmerus) callidus, n. sp. 



Male, female. Four specimens from Mt. Hood, and six from 

 Washington show a very great resemblance to A. notatus, but with 

 the following differences: the gibbosity of the face extends further up, 

 the legs are distinctly stouter, and all the femora have a conspicuous 

 preapical red ring; the tibiae and tarsi in some are wholly deep red, 

 with the base of the former lighter colored; in others, the tarsi are 

 pitchy black or black, and the tibiae on their inner side colored in the 

 same way. 



In one female from Washington, the gibbosity does not seem to 

 extend as high, the pollen of the thorax and of the sides. of the face is 

 yellowish, and the legs are black, with a broad preapical ring on the 

 femora, and the base of the femora and of the metatarsi yellow. 



Asilus (Rhadiurgus) leucopogon, n. sp. 



Male, female. Face and front broad, densely covered with nearly 

 white pollen; hair and bristles of the head everywhere white; face, in 

 profile, nearly vertical and straight, a slight concavity on the upper 

 part, only; the hair reaches to above the middle. Antennae black, 

 the first two joints together rather longer than the third; arista rather 

 stout, shorter than the third joint; beard abundant, silky. Dorsum 

 of thorax densely light yellowish or brownish pollinose, the narrow 

 brown stripes not conspicuous; clothed in front with short black and 

 white bristles; behind with light-colored, not stout bristles. Scutellum 

 with numerous, erect, white bristles and hairs. Pleurae and pectus 

 densely white pollinose, with white hair and bristles. Abdomen elon- 

 gate, slender, light grayis'i pollinose; when seen from behind brownish 

 before the smooth, gray hind borders; oviduct cylindrical, shining, 

 with a circlet of small bristles at the extremity. Legs with abundant, 

 recumbent, white hair, and wi,th wliite bristles; black, the base and 

 more or less of the inner sides of the femora, the inner part of the 

 tibiae, and the base of the tarsal joints, more or less yellow. Wings 

 nearly pure hyaline; anterior branch of the third vein nearly straight, 

 the posterior branch somewhat curved forwartl, but not reaching the 

 tip of the wing. 



Length, 15-17 mm. 



