

Upper: Fig. 64. Tiger Lizard (Crotaphytus wislizenii) 

 One of the conspicuous lizards of the arid region 



Lower: Fig. 65. Western Collared Lizard (Crotaphytus 



COLLARIS BAILEYl) 



One of the most spectacular lizards of the Cave Region. Photo- 

 graph by A. L. Gibson, Arizona. 



168 



