REPTILES 



371 



Photograph by E. R. Sanborn, N. Y. Zool. Soc. 

 FIG. 148. Gila monster (Helodcrma suspectum). 



FIG. 149. 



Photograph by E. R. Sanborn, N. Y. Zobl. Soc. 

 Iguana '(Iguana tuberculata) , a large lizard common in tropical America. 



of the pigment in the chromatophores ; it may be 

 brought near the surface, giving a dark color, or with- 

 drawn from sight, when the skin appears pale or white. 

 Chameleons have enormously long tongues, which are 

 thrust out to capture insects. Lizards have consider- 

 able power of renewing lost parts, particularly the tail. 

 A species found in New Mexico has a bright blue tail, 

 and it can hardly be doubted that this serves to attract 



