THE LIZARDS 143 



touches to the gay coloration, the throat is of a deep, 

 orange hue, while there are numerous rusty red spots 

 scattered over the hind legs. Not to be outdone, the 

 female as well takes on especially gay colors during the 

 earljr summer. She is normally a slaty gray, with a 

 much narrower collar than the male. Before the eggs 

 are laid, however, her sides assume the brightest of brick 

 red hues, dots of the same color appearing on the limbs 

 and sides of the tail. Notwithstanding its stoutness of 

 body, the Collared Lizard runs at great speed — generally 

 upon the hind legs. These lizards are also able to hop 

 and jump like a frog, owing to the long hind legs; such 

 tactics are adopted in traversing rocky places. 



The range of this species is from Kansas to Arizona. 

 C. wislizenii — the Leopajid Lizard, is closely allied. It 

 lacks the black collar and the head is proportionately 

 narrower. The coloration is brownish gray with bold 

 brown spots and blotches; across the back are brick red 

 streaks; the limbs are reticulated with the latter hue. 



UmUj Callisaurus and Holbrookia are closely allied 

 genera of western North America. The species are 

 small, yellowish gray, with tw^o or more rows of dark 

 blotches on the back. Callisaiirus draconoides is called 

 the Zebra-tailed Lizard, as in running it carries the 

 tail curled over the back, showing the underside of that 

 appendage, which is chalky white with bold black bars. 

 There are five species of Holbrookia. All are easily 

 distinguished from Callisaurus by the absence of an ear 

 opening. 



The Swifts: Lizards of the important genera Uta 

 and Sceloporus, abound in western North Anerica, 

 Mexico and Central America; in the former country 

 they are generally called Swifts. The term is appro- 

 priate, as they displaj^ great agility, rendering capture 



