2/2 ENTOMOLOGICAL NEWS. [June, 'lO 



domen more strongly sculptured ; last dorsal segment much more ver- 

 tical, less depressed, surpassing last ventral (the reverse is true of 

 gcibrielis) ; legs black without metallic colors. 



Hab. Claremont, California (Baker). 



Osmia casta sp. nov. 



9. Length about n mm., robust, head and thorax dark greenish- 

 blue, abdomen rather greener than blue, very shiny ; pubescence all 

 black, except for some reddish on anterior tarsi, and a very slight ad- 

 mixture of glittering white hairs on scutellum and mesothorax ; mand- 

 ibles tridentate, the inner tooth a mere angle ; no light hair under 

 margin of clypeus; wings strongly infuscated. This may be a race 

 of O. artocyauea Ckll., with which it agrees in most respects, differing 

 by the densely confluently punctured mesothorax, and the total absence 

 of white hair on the metathorax and first abdominal segment; the 

 apical tooth of the mandibles is very well developed. The legs are 

 black without metallic tints. 



Habitat.- Claremont, California (Baker). 



Osmia putata sp. nov. 



9. Length about u mm., robust, brilliant deep indigo blue, the 

 mesothorax darker and bronzy; pubescence black. Very like O. casta, 

 but separated as follows : abdomen blue with hind margins purplish ; 

 dorsum of thorax without light hairs; tufts of orange hair under 

 margin of clypeus (none in casta) ; mandibles quadridentate, but the 

 two inner teeth short and blunt; hair of cheeks and abdomen much 

 shorter; hind spur of hind tibia thicker, and not much curved (strongly 

 curved in casta) ; second r. n. joining second s. m. at least two-thirds 

 as far from apex as first from base (about half as far from apex as 

 first from base in casta) ; eyes longer, and apparently differently colored. 



Hab. Mountains near Claremont, California (Baker). 



Osmia nassa sp. nov. 



9 Length 11-12 mm., robust deep indigo blue, the abdomen shining; 

 pubescence black. Superfically like O. casta and putata. but easily 

 separated by the clypeus, which is convex, shining, with very strong 

 well-separated punctures, whereas in the others it is minutely and ex- 

 tremely densely punctate, so as to appear granular ; no light hair under 

 clypeal margin ; mandibles long, quadridentate, the cutting margin very 

 oblique (thus the inner angle is much less prominent than in O. earn) ; 

 sides of vertex and middle of mesothorax with very strong well- 

 separated punctures ; abdomen smoother and less closely punctured 

 than in O. casta or putata; hind spur very straight, with hardly any 

 curve ; wings very brown ; legs without metallic color. 



