334 PROCEEDINGS OF THE ACADEMY OF [1897. 



NEW AND LITTLE-KNOWN NORTH AMERICAN BEES. 

 BY T. D. A. COCKERELL. 



Osmia viridimicans n. sp. » 



9 . Length 12 ram., brilliant peacock- green, the pubescence entirely 

 black. Head large, thorax ordinary, abdomen somewhat elongate, 

 the straight sides almost parallel, but slightly diverging to the fourth 

 segment ; after which the sides rapidly converge, meeting at the 

 apex at about a right angle. The light shines on the abdomen in 

 such a way as to give the impression of deep sutures, which in fact 

 do not exist. Punctuation ordinary, punctures of vertex and meso- 

 thorax distinct and separable. Basal area of mesothorax with its 

 lower portion smooth and shining. 



Lower part of face bluer than the vertex ; cheeks broader than 

 eyes ; black pubescence of face tolerably abundant ; front edge of 

 clypeus black, straight, not produced at sides; mandibles 4-dentate; 

 teguke green ; wings smoky, hyaline, apical margin broadly darker, 

 no dark streak in marginal cell; first recurrent nervure reaching 

 second submarginal cell a very short distance from its base, second 

 recurrent reaching it at the beginning of the apical fourth ; legs 

 bright green, the tarsi black ; ventral scopa entirely black. 



Hab. — Olympia, Wash., one 9 , June 5, 1895 (T. Kincaid). 

 Readily known by its large size and the characters italicized. Mr. 

 Fox sends me a Nevada example of 0. maura, which though en- 

 tirely black, has the same form as viridimicans, and agrees in hav- 

 ing the second recurrent nervure reaching the second submarginal 

 cell quite at the beginning of the apical fourth. 



Osmia cobaltina Cresson, 1878. 



Three 9 s from Pasco, Wash., May 25, 1896 (T. Kincaid), are 

 of a very beautiful deep blue color, and agree with Cresson's descrip- 

 tion. 



•Osmia kincaidii n. sp. 



9 . Length 6 to 8 mm., brilliant peacock-green, the pubescence 

 very sparse, black and dirty white mixed. Head large, thorax sub- 

 globose, abdomen short and oval. Punctuation ordinary, punctures 

 distinctly separated on mesothorax, closer and largely confluent on 



