SNAKES OF THE GENUS PITUOPHIS 



147 



Specimens from the coastal counties of central and northern Cali- 

 fornia show in general a higher number of dorsal spots on both body 



20 30 94 36 19 17 



234 

 232 

 230 

 228 

 226 

 224 

 222 

 220 

 218 

 216 

 214 

 212 

 210 

 208 

 206 



Region 1 

 No, 



10 



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Figure 66.— Geographic variation in number of ventrals in PUuophi$ catenifer catenifer. 

 4 9 20 27 91 35 19 17 9 7 



80 

 78 



76 

 74 

 72 

 70 

 68 

 66 

 64 

 62 

 60 

 58 

 56 

 54 







i \ J^^ 



. ^^— I 



Region 

 No. 



1 23456789 10 



FiouEE 67.— Geographic variation in number of caudals in Pituophis catenifer catenifer. 



and tail than do specimens from the counties farther inland (figs. 

 70-72). In scale counts, however, no consistent variation between 

 these two areas could be discovered. 



