42 THE CANADIAN ENTOMOLOGIST. 



long, dense, pale yellow pubescence, becoming whitish about base of 



antennae; flagellum ferruginous beyond the first joint, which is less than 



half as long as second, the median ones twice as long as broad; meso- 



thorax more finely and sparsely punctured, a large, shining, impunctate 



discal space with scattered punctures laterally; legs shining black except 



for the ferruginous tarsi and posterior knees; abdomen slender, its first 



segment very polished and shiny, practically impunctate, with long pale 



hairs, especially basally, following segments duller, indistinctly punctured, 



segments i-6 with rather narrow and loose fasciae of yellowish white 



pubescence continued very narrowly on venter, sparse, very short, pale 

 hairs between, apex practically nude. 



Types. — Lincoln, Nebraska, July, ? , (^ . 



This species flies at Lincoln in July and early August, visiting the 

 flowers of Solidago Missoui'ieusis. Its nearest ally seems to be C. 

 Wilmattce, Ckll., which is an oligotropic visitor of Petalostemon, and which 

 flies at the same time; it is readily distinguished from that species by 

 smaller size, dark legs, normal thoracic pubescence, etc. 



Colletes ochraceus, n. sp. — $ . Near to C. solidaginis^ but easily 

 distinguished from that species as follows: Larger, length 1 1 mm. Clypeus 

 distinctly sulcate medially, especially towards the apex, and more coarsely 

 punctured. Antennae rather shorter and heavier, wholly black. Vertex 

 with a few large punctures scattered on a minutely punctured surface. 

 Pubescence of thoracic dorsum only slightly tinged with fulvous. Enclos- 

 ure extremely small, its bowl shining but very small and irregularly 

 roughened, the neck long and narrow. Sides of posterior face of meta- 

 thorax strongly and rather closely punctured, the pubescence yellowish 

 white. Nervures and stigma yellowish brown. Legs black, with silvery 

 pubescence, the pectination of the hind spur very distinct, with about a 

 dozen teeth. 



Type. — Southern California (D, A. Saunders), one $ specimen. 



Colletes rufithorax, n. sp. — 9 • Length 14-15 mm. Differs from C. 

 ihoracicus as follows: Clypeus more coarsely and striately punctured, 

 especially apically, vertex with punctures of two conspicuously distinct 

 sizes; punctures on cheeks coarse and well separated on a finely striate 

 surface; joint 3 of antenna; = 4 ; malar space slightly longer; wings heavily 

 clouded, nervures fusco-ferruginous ; pubescence of face above clypeus 

 strongly tinged with orange, that on thorax above brighter, more rusty red ; 



