U. S. DEPARTMENT OF AGRICULTURE 

 BUREAU OF BIOLOGICAL SURVEY 



HENRY W. HENSHAW, Chief 



NORTH AMERICAN FAUNA 



ISTo. 39 



[Actual date of publication, November 15, 1915] 



REVISION OF THE POCKET GOPHERS OF 

 THE GENUS THOMOMYS 



VER]SrON BAILEY 



CniEr FIELD NATURALIST, BIOLOGICAL SURVEY 



WASHINGTON 

 GOVERNMENT PRINTING OEEICE 

 1915 



