U. S. DEPARTMENT OF AG^J ;nLTURE ^ 



BUREAU OF BIOLOGICAL SURV >4^x. u 



NORTH AMERICAN FAUNA 



No. 37 



[Actual date of publication, October 26, 1908] 



A BIOLOGICAL INVESTIGATION^ OF THE 

 ATHABASKA-MACKENZIE REGION 



BY 



EDWARD A. PREBLE 



ASSISTANT, BIOLOaiCAL SURVEY 



Prepared under the direction of 

 Dr. C. HART MERRI^ M 



CHIKF OF BUREAU OF BIOLOGIC^.L SURVEY 



GOVERNMENT P R I . t > O F T I C E 



19 08 



