THE CANADIAN ENTOMOLOGIST. 157 



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SYNOPSIS OF BEFS OF OREGON, WASHINGTON, BRITISH 

 COLUMBIA AND VANCOUVER,— II. 



by h. l. viereck, assisted by t. d. a. cockerell, e. s. g. titus, 

 j. c. crawford, jr., and m. swenk. 



Andrenid^. 

 The species here treated belong to genera previously " lumped " 

 under Andre?ia. 

 Three submarginal cells. 



$ with joint 3 of the antennae shorter than 4 and 5; $ with joint 3 

 shorter than 5, rarely as long as 4 ; sculpture in both sexes with few 

 exceptions coarse, enclosure usually ridged, depressions of abdominal 

 segment usually sharply defined ; $ with a simple tibial 



scopa T7-acha7idrena. 



$ with joint 3 as long as or longer than 4 and 5 ; $ with joint 3 

 longer than 4. 



Tibial scopa of 9 simple Andrejia or Opandrena. 



^ . Clypeus or face without yellow marks ; joint 3 not longer 



than 4 and 5 Andrena. 



$ . Clypeus or face with yellow marks Opandrena. 



Tibial scopa of $ plumose. 



Tibial scopa thin, thinly plumose; ^ without yellowish face 

 marks; joint 3 longer than 4 and 5, cheek with a rounded 



angle Ptilandrena. 



Tibial scopa dense, densely pubescent; ^ the same 



as ^ Opandrena Ftera?idrena. 



Two submarginal cells in both sexes ; ^ with yellowish face 



marks Parandrena. 



For details of the new species of Andrenidse, see classification of 

 North American species, which will appear in Transactions American 

 Entomological Society, Phila. 



Trachandrena, Robt. 

 Females. 



Second dorsal segment depressed about one-third cratagi. 



Second dorsal segment depressed more than half, but not more than 



two-thirds i . 



Second dorsal segment depressed two-thirds or more 8. 



I. Abdomen without distinct whitish fasciae 2. 



Abdomen with distinct whitish fasciae at least laterally 5. 



