Records of Bees. 449 



faintly brownish beneath, but quite dark ; legs not metallic ; 

 abdomen narrower and less shining ; marginal cell longer and 

 narrower apically. The head is rather large ; there are dark 

 hairs about tl e ocelli ; the thorax is wholly without dai-k 

 hair. There is a dark stain at the apex o£ the marginal cell. 

 Notch in sixth abdominal segment strong. 



In the Florissant table it runs to 0. faceta, but differs in 

 tlie antennw, &c, Oomj}ared with 0. Wheeleri, the abdomen 

 is duller and tlie sixth segment differently sliaped. The 

 clyj)eus is practically black; in Wheeleri it is blne-grecn. 

 In the Boulder County table, (). enenaxxxn^ to a'prilina, from 

 which it differs in the form of the abdomeU; the colour of the 

 })u])escence, &c. 



lluh. Florissant, Colorado, June 23, 1907 {8. A. Rohwer). 



Osmia vallicola, sp. n. 



(J . — Length about y mm. 



tSuperficially similar to O. mertensi'ce, but smaller, witli the 

 flagellum wholly dark, the apical tooth of mandibles longer, 

 the liead and thorax greenish blue ; the vertex, front, and 

 thorax above with scattered very long black hairs; upper 

 part of pleura with the hair black; marginal cell longer; 

 second submarginal cell very long. The legs are strongly 

 metallic ; the abdomen is very shiny, and of the same tint 

 as that of mertensire ; sixth segment rather feebly notched ; 

 venter and tarsi normal. 



In the Florissant table runs to o, and runs out because of 

 hair of pleura half black and half light. In the Boulder 

 County table it runs to O. proptnqua, hut the Hagelluni is 

 not moniliform, and there are many other differences. 

 {0. jyropinqua does occur at Florissant, both sexes having 

 been taken by Mr. Rohwer from flowers of SalLo hrachy- 

 furpa, June 11, 1907.) 



Hab. Florissant, Colorado, at flowers of Rihes vallicola, 

 June 11, 1907 (S. A. Rohioer). 



Osmia nigrifrons, Cresson, 1878. 



Three females at flowers of Senecio tridenticidatus, Floris- 

 sant, Colo., June 14, 1907 {S. A, Rohwer). 



Osmia Wheeleri, Ckll., 1906. 



One male at flowers of Gastilleia integra, Florissant, Colo., 

 June 23, 1907 {S. A. Rohioer). 



Osmia fieri ssanticola, Ckll., 1906. 



Two females at flowers of Aragallus Lamberti (sens, lat.), 

 Florissant, (^lo., June 1907 ('/'. J). A. CockereU). 



