50 Mr. T. D. A. Cockerell on Bees of the 



Pleura closely punctured, subcancellate. Thoracic pubescence 

 short and rather sparse, dull yellowish grey or, one might 

 say, pale greyish ochreous. Tegulte shining piceous, not 

 noticeably punctured. Wings hyaline ; ncrvures piceous, 

 stigma fuscous. Legs with mouse-coloured pubescence; 

 tarsi dark; tibial spurs dark brown ; hind spur of hind tibia 

 pectinate, with about fifteen teeth. Inner tooth of claw 

 short, diverging from the outer. Abdomen rather narrow, 

 subconical, moderately shiny, punctuation of first segment 

 fine but strong and rather close, of the remaining segments 

 minute and obscure. Base of first segment sparsely liairy ; 

 hind margins of segments 1 to 4 with bands of whitish 

 pubescence ; second segment very feebly j)ubescent at ex- 

 treme base. Venter with rather abundant fairly long mouse- 

 grey pubescence. 



Hob. Santa Fe, N. M., at flowers of Chamcesaracha coro- 

 nojpus in grounds of Capitol, Aug. 2 [Ckll. 4081). 



The punctuation of the first abdominal segment is con- 

 spicuously finer than in testivalts. 



§§ Lateral faces of posterior Iruucation of thorax sliiuiug or fuberculate, 

 uot miuuU'ly rougheued. 



X. Punctuatiou of lirst abdominal scgmeut relatively sparse and 

 fiue ; vernal species. 



Colletes salicicola, sp. n. 



$. Length about 10 millim. 



Stoutly built, black (including tarsi), with rather short but 

 abundant pale grey or greyish-white pubescence, faintly tinged 

 with yellowish on dorsum of thorax. Head tolerably broad, 

 but hardly as broad as thorax ; vertex depressed, its sides 

 sparsely punctured, contrasting with the closely punctured 

 front. Pubescence of face and cheeks tolerably abundant 

 " frightened mouse " colour. Clyi)eus with very large sparse 

 punctures. Antennaj wholly dark, fiist joint of flagcllum not 

 twice as long as second. Mandibles wholly dark, blunt. 

 Labrum with a round median pit. Space between eye and 

 base of mandible about twice as broad as long. Prothoracic 

 spine ajtparcntly wanting. Mesothorax with large, rather 

 sparse punctures. Base of mctathorax with numerous spaces, 

 longer than broad, enclosed by ridges. Sides of posterior 

 triangle obliquely ridged. Lateral faces of posterior trunca- 

 tion shining, distinctly but sparsely punctured. Tegula3 pale 

 testaceous, shining. Wings perfectly hyaline; ncrvures and 

 stigma black, costal uervure brown. Second submarginal 



