ir 



dsofO 



regon 



Ira N. Gabrielson 



CHIEF 

 BUREAU OF BIOLOGICAL SURVEY 



and 

 Stanley G. Jewett 



REGIONAL BIOLOGIST 

 UNITED STATES BIOLOGICAL SURVEY 



Published by 



OREGON STATE COLLEGE 

 CORVALLIS, OREGON 



Through the O.S.C. Cooperative Association 



