154 



BULLETIN 61, UNITED STATES NATIONAL MUSEUM. 



172 



156 

 148 

 140 

 152 



I.— Diagram .showing the variation in the number of ventral scutes in 

 Thamnophis ordinoides. 



95 

 85 

 77 

 69 

 61 

 53 



Fresno. 

 Cal. 



Santa Cruz 

 County. 

 Cal 



Nicasio, Cresent 

 San Pablo Citv, 



Creek, San 



Francisco, 



Cal. 



Cal. 



Gold 



Beach, 



Cal. 



Portland 

 Oreg. 



Puget 



Sound. 



Seattle, 



Fort 



Steilacoon, 



Tacoma, 



Wash. 



Coinox 

 Lake, 

 Vic- 

 toria, 

 Van- 

 couver 

 Island. 



Fig. 67.— Diagram showing the variation in the number of subcaudal scutes in 



Thamnophis ordinoides. 



