SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 

 Bulletin 175 



VARIATIONS AND RELATIONSHIPS 



IN THE SNAKES OF THE 



GENUS PITUOPHIS 



BY 



OLIVE GRIFFITH STULL 



L^^l'it^^^? 





r^. 



# 





UNITED STATES 



GOVERNMENT PRINTING OFFICE 



WASHINGTON : 1940 



For sale by the Superintendent of Documents, Washington, D. C. Price 35 cents (paper) 



