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U. S. DEPARTMENT OF AGRICULTURE 



BUREAU OF BIOLOGICAL SURVEY 



NORTH AMERICAN FAUNA 



No. 27 



[Actual date of publication, October 26, 1908] 



A BIOLOGICAL INVESTIGATION OF THE 

 ATHABASKAMACKENZIE REGION 



BY 



EDWARD A. PREBLE 



ASSISTANT, BIOLOGICAL SURVEY 



Prepared under the direction of 

 Dr. C. HART MERRIAM 



CHIEF OF BUREAU OF BIOLOGICAL SURVEY 



WASHINGTON 



GOVERNMENT I'll IN TING OFFICE 



1 9 8 



