CROCODILIANS, LIZARDS, AND SNAKES. 369 



to shoulder, black; the former with two usually cputluent blue spots. 

 Sides dusky. A blue i^atch ou each side of the belly; black internally 

 and behind. Female without the blue and black of under parts, which 

 are whitish, with short, dark longitudinal lines. 



There are three well-marked color forms or subspecies of the S. undu- 

 latus, which differ as follows. The characters given are, however, not 

 without exceptions: 



Head scales usually wrinkled; color brown, with nndnlating brown cross 

 bars S.u. undidatus. 



Head scales smooth; two pale dorsolateral stripes, or small, brown, dorsal spots; 

 smaller S. u.consohrinus. 



Head scales smooth ; green, -with eight cross bands S.u. tristichus. 



Fig. 57. 



SCELOPORUS UNDULATUS LATREII.I.E. 



= \. 



Alabama. 



Cat. No. S1090, U.S.N.M. 



Of these subspecies the 8. u. midulatus is found across the continent; 

 the 8. v. consohrinus is Texan and Sonoran; while S. u. tristichus is 

 only known from the Kocky Mountains. 

 NAT MU!5 98 24 



