SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 

 Bulletin 61 



VARIATIONS AND GENETIC 



RELATIONSHIPS OF THE 



GARTER-SNAKES 



BY 

 ALEXANDER G. RUTHVEN 



Curator of the University JMuseum, U?iiversity of 3lichigan, Ann Arbor 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1908 



