U. S. DEPARTMENT OF AGRICULTURE 



BUREAU OF BIOLOGICAL SUMEY 



NORTH AMERICAN FAUNA 



N'o. '27 



[Actual date of publication, October 26, 1908] 



A BIOLOGICAL INVESTIGATION OF THE 

 ATHABASKA-MACKENZIE 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 PRINTING OFFICE 



19 0 8 



40 3 W 



