336 PROCEEDINGS OF THE ACADEMY OF [1897. 



The female of 0. kincaidii is easily separable from anything de- 

 scribed, by its brilliant color, small size, and partly pale pubescence 

 on thorax and face. The S is not so easily separated, and should 

 be compared with exigua from California, bella from Colorado, and 

 illinoensis from Illinois. It agrees with Cresson's description of 

 exigua except that none of the specimens are quite so small, and the 

 tarsi are not testaceous, but black with a metallic tint, the last joint 

 rufescent or wholly dark. From bella it will be known at once by 

 the absence of black pubescence on the abdomen. From illinoensis 

 it differs by the distinctly infuscated wings, the second submarginal 

 cell not longer than first, the abdominal pubescence not subfuscous. 

 It is quite possible that the present species may eventually prove to 

 be a northern, larger and darker race of the Californian exigua, hut 

 it is desirable to distinguish it, whether as a species or as a race. 



It is to be remarked that Provancher (Add. Faun. Hym., p. 330) 

 records a male from Ottawa, attributed to 0. exigua. I cannot 

 think it likely that this identification is correct, but it is impossible 

 to reach any definite conclusion, since Provancher's description ap- 

 pears to be simply a translation of Cresson's. It may be that he 

 had illinoensis before him. 



The body-colors of both sexes of 0. fulgida (Colorado examples 

 sent by Mr. Fox) agree with the colors of the corresponding sexes of 

 kincaidii, but fulgida, while about as broad as kincaidii, is conspic- 

 uously longer, the abdomen being shaped more like that of viridi- 

 micans. 



Osmia bella Cresson, 1878. 



A $ specimen from Olympia, Wash., June 19, 1895 (T. Kin- 

 caid), must be referred to bella, but it represents a variety with 

 darker wings, and the apical pubescence of the second ventral seg- 

 ment pale. It is of a brilliant green color, and is conspicuously 

 larger than the males of kincaidii. The black pubescence on the 

 apical portion of the abdomen is very evident. The second sub- 

 marginal cell is noticeably longer than the first on the cubital nerv- 

 ure. Robertson's illinoensis must be very near to bella. A Colo- 

 rado bella from Cresson's series, lent by Mr. Fox, is somewhat 

 smaller than the Olympia example, distinctly bluer, and the second 

 submarginal cell is only about as long as the first on the cubital 

 nervure. 



