U. S. DEPARTMENT OF AGRICULTURE 

 BUREAU OF BIOLOGICAL SURVEY 



HENRY W. HENSHAW, Chief 



NORTH AMERICAN FAUM 



ITo. 37 



[Actual date of publication, April 7, 1915] 



REVISION OF THE AMERICAN MARMOTS 



BY 



ARTHUR H. HOWELL 



ASSISTANT BIOLOGIST, BIOLOGICAL SURVEY 



I 



WASHINGTON 

 GOVERNMENT PRINTING OrEIOE 

 1&15 



