Scalation of snake. A, Dorsal view of head, Thamnophis 

 sp.; B, ventral view of head, Pituophis sp.; C, junction of body 

 and tail; D, lateral view of head, Thamnophis ordinoides vagrans; 

 E, Junction of body and tail; Charina bottae utahensis. 1, rostral; 

 2, internasal; 3, prefrontal; 4, frontal; 5, supra-ocular; 6, parietal; 

 7 and 8, first and second temporals; 9, symphyseal; 10, infra- 

 labials; 11 and 12; anterior and posterior genials; 13, preocular; 

 14, postocular; 15, gastrostege; 16, anal plate; 17, urostege; 18, 

 supralabials; 19, and 20, nasals; 21, loreal; 22, vestigal limbs. 



