U. S. DEPARTMENT OF AGRICULTURE 

 BUREAU OF BIOLOGICAL SURVEY 



NORTH AMERICAN FAUNA 



No. 27 



[Aetna] date of publication, October 26, 1908] 



A BIOLOGICAL INVESTIGATION OF THE 

 ATHABASKA MACKENZIE REGION 



BV 



EDWARD A. PREBLE 



ASSISTANT, BIOLOGICAL SURVEY 



Prepared under the direction of 



Dr. C. HART MERRIAM 



CHIEF OF BUREAU OF BIOLOGICAL SURVEY 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 

 1908 



