554 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



Florissant, Colorado. Type, female collected on June 28, 1908, on 

 flowers of Senecio cyambalarioides Nuttall; two other females collected 

 June 15 and June 21 ; two males collected near Florissant on June 18, 

 1906, one at flowers of Senecio, sp.; one male collected east of Lake 

 George (near Florissant), June IS, by W. P. Cockerell. Unless other- 

 wise stated, the specimens were collected by S. A. Rohwer. 



Type.— Cat. No. 13732, U.S.N.M. 



PTEROCHILUS LEUCOTiENIUS, new species. 



Should be easily recognized by its size, whitish markings, and rufo- 

 ferruginous legs. 



Female. — Total length about 14 mm. Clypeus convex, depressed 

 apically to the truncate anterior margin, the angles of the truncation 

 sharp, in outline pentagonal, feebly punctured basally, apically with 

 rather large, irregular, separate punctures; front with close, well- 

 defined punctures, vertex and occiput with smaller and more widely 

 separated punctures ; front raised between the antenna? ; no incomplete 

 impressed line from the anterior ocellus; occiput carinated, broadly 

 arcuately emarginate; antenna? robust, the third joint subequal with 

 the two following; mesonotum and scutellum punctured similar to the 

 front; notauli present only posteriorly; metanotum rounded perpen- 

 dicular; abdomen dulled with fine reticulations, the apical margins 

 of the three last segments with irregular punctures. Black; basal 

 half of clypeus, except two spots, narrow inner orbits below emargi- 

 nation, pronotum dorsally in part, tegula? except middle spot, spot 

 beneath tegulas, two small spots on scutellum, line on metanotum, 

 spots on lateral posterior angles of prododeum, band on all the dorsal 

 segments, slightly dentate laterally on the apical ones, band on second 

 and spots on third ventral segment whitish; scape beneath and legs 

 beyond bases of femora ruf o-f erruginous ; wings dusky hyaline, basad 

 of basal vein slightly yellowish, apical margin distinctly dusky; basal 

 venation and stigma yellowish, apical venation dark brown. 



Paratypes show that the clypeus may be entirely pale. 



Lethbridge, Alberta, Canada. Five females collected July 4 and 9, 

 1909, by Mr. J. B. Wallis. 



Type.— Cat. No. 13731, U.S.N.M. 



PTEROCHILUS DIVERSICOLOR, new species. 



Perhaps related to Pterocliilus luteicollis Cameron, but differs from 

 his description of this species in many characters. 



Female. — Total length 9 mm. Slender; clypeus in outline nearly 

 hexagonal, much wider than long, apex gently rounded, the angles 

 obtuse, surface finely punctate-striate ; mandibles slender, with three 

 blunt, inner teeth; front hardly produced between the antenna?; 

 front with separate, rather large punctures, vertex and cheek more 



