THE CANADIAN ENTOMOLOGIST. 93 



& 



SYNOPSIS OF BEES OF OREGON, WASHINGTON, BRITISH 

 COLUMBIA AND VANCOUVER. 



BY HENRY L. VIKRECK, ASSISTED BY T. D. A. COCKERELL, E. S. G. TITUS, 

 J. C. CRAWFORD, JR., AND M. H. SWENK. 



This first guide to the bees of the " Great Northwest " is presented in 

 the hope that it will encourage the collection and study of these 

 interesting insects in a region which is only now beginning to yield its 

 treasures in this department of science. 



The species are, in the main, arranged from generalized to specialized 

 types ; the groups follow one another, as in the recently proposed scheme 

 of Mr. Charles Robertson, whose papers on the classification of bees have 

 appeared, with few exceptions, in this journal. 



Prof. Cockerell's published work on Nomadidte has been drawn upon 

 for the portion of this synopsis which relates to that family. Mr. E. S. G. 

 Titus, Mr. J. C, Crawford and Mr. M. H. Swenk have contributed, or will 

 contribute, respectively, the Megachilidfe, Halictidse ar.d CoUetidte — to 

 all I am greatly indebted. Those papers of Robertson that have not 

 appeared in the Canadian Entomologist have been drawn upon for the 

 generic synopsis in Bombidte and Andrenidse. 



Prosopid^e, Prosopis, Fabr. 

 Female. 

 8 mm. Entirely black ; wings strongly brownish ; dull, sculpture dense, 

 disc of metathorax rugose ; abdomen shining, second segment depressed 



about one-third, indistinctly in the middle basalis. 



Prosopis basalis^ Sm. — Brit. Mus. Cat. I., 23. 

 Vancouver. (Am, Ent. Soc. Phila.) 

 , Males. 



Scape immaculate. 



Superior extensions of the lateral face-marks distinctly separated from 



the eyes citriiiifrons. 



Superior extensions of the lateral face-marks contiguous with the 



eyes divergens. 



Scape maculated. 



Superior extensions of the lateral face-marks shaped like commas and 

 abruptly separated from the eye margins ; abdomen dull, wings 



brownish Baker i. 



Superior extensions of the lateral face-marks not shaped like commas 

 nor abruptly separated from the eye margins ; abdomen 

 shining Mesillce. 



