370 THE CANADIA.N ENTOMOLOGIST. 



NEW BEES OF THE GENERA OSMIA AND ANDRENA. 



BY T. D. A. COCKERELL, BOULDER, COLO. 



The bees now described not only appear to difiter from any previously 

 published ; but they have been kindly examined by Messrs. Viereck and 

 Titus, and found to differ from all of the numerous species which they 

 have named in manuscript, and will shortly publish. 



Osmia Davidsoniella, n. sp. 



(^ . — Length slightly over 8 mm., steel blue, the colour not 

 especially bright, with dull white pubescence, which is long and erect on 

 head and thorax ; vertex and mesoihorax closely and strongly punctured. 

 Head larger, with the vertex broad ; mandibles and antennae black ; 

 flagellum slender, but not moniliform ; mandibles strongly bidentate, the 

 inner tooth broadly obliquely truncate ; anterior edge of clypeus normal ; 

 tegulse shining black ; wings rather dusky, upper half of marginal cell 

 strongly smoky, nervures black ; legs black, hair on inner side of tarsi 

 pale ferruginous ; abdomen shining, with distinct but well-separated punc- 

 tures ; hind edge of sixth dorsal segment turned outwards, with a broad, 

 very shallow emargination ; seventh segment ending in two short spines, 

 the interval between them being nearly twice the length of either. 



Hab. — Los Angeles, California (Davidsoji). A discussion of the 

 relationship of this and the following species will be given by Mr. Titus in 

 his revision of Osmia. 



Osmia Titusi, n. sp. 



$ . — Length about 8 mm, dark olive green, bluer on the abdomen, 

 yellower on the face, the clypeus with about the anterior half black, and 

 the part just above the black crimson. Legs dark chestnut red. 

 Pubescence dull white, the ventral scopa white, but in the type specimen 

 full of orange pollen. Head and thorax extremely densely punctured, 

 abdomen with close minute punctures. Head broad ; flagellum chestnut 

 red beneath; mandibles dark reddish towards ends, bidentate, both teeth 

 long and sharp ; anterior margin of clypeus normal ; tegulse shining bright 

 rufo-fulvous ; wings slightly dusky, nervures piceoiis ; hind spurs bright 

 ferruginous ; hind tibiae stout, basal joint of their tarsi broad ; abdomen 

 subglobose. The marginal cell is comparativ^ely short, and broadly 

 rounded at end ; in O. Davidsoniella it is much longer, and bluntly 

 pointed. 



Hab. — Los Angeles, California (Davidson). Named after Mr. E. S. 

 G. Titus, our best authority on the American species of Osmia. 



November, 1905. 



