4o8 REPTILES xv. 9 



be spread out and used for gliding, though it is not moved in true 

 flight. Lyriocephalus from Ceylon is an agamid with a remarkable 

 convergent similarity to the chameleons. Some agamids (and other 



Fig. 234. Chameleon catching a fly, showing its changes in colour. 



A, cream with yellow patches, the usual night colour. B, grey-green with 

 darker patches. C, dark brown patches and yellow spots. D, reaction pro- 

 duced by pinching tail, inflation and darkening of all spots. (After Gadow.) 



lizards) can run on their hind legs when they are in a hurry (Fig. 240). 

 In agamids the teeth are set squarely on the summit of the jaw, as in 

 Sphenodon; this condition is termed acrodont. In most other lizards 

 the teeth are attached obliquely to the inner side of the jaw (pleuro- 

 dont). 



The iguanids are found mainly in the New World and parallel the 

 agamids in many ways. Anolis is a small, common North American 

 form. Iguana from south and central America reaches 6 ft in length. 



