22 BULLETIN 114, UNITED STATES NATIONAL MUSEUM, 



Usually two anterior tem- 

 porals; scale formula 

 very rarely lower than 

 19-21-19-17. 



cd. Whitish annxili or 

 cross bands 18 to 

 23; pattern of body 

 practically in rings. 

 ainaur a, Tp. 172. 

 (Lower Missis- 

 sippi Valley.) 

 cc^. Whitish across bands 

 23 to 60; pattern of 

 dorsal saddles or 

 blotches of red or 

 brown. 

 dd'^. Infralabials 8 or 9, 

 rarely 10; tail 

 less than 16 per 

 cent of total 

 length; often a 

 dark band from 

 eye to angle of 

 month. 

 ee^. Dorsal saddles 35 

 to 60, reaching 

 down to the 

 fifth or third 

 row of scales; 

 often two rows 

 of lateral alter- 

 nating blotch- 

 es; a dark band 

 on posterior 

 portion of pre- 

 frontals; a 

 black-border- 

 ed light band 

 from the eye to 

 the angle of the 

 mouth; usually 

 a Y-shaped 

 light spot on 

 the back of the 

 head. 



trian g ulum, 

 p. 188. 



(Eas tern 

 United States 

 and southern 

 Canada.) 



