LIZARDS. 



303 



be owing to the fact that the skin contains two differ- 

 ent layers of pigment, one yellowish gray, the other 



FIG. 257. 



GILA MONSTER (Heloderma suspectum). 

 FIG. 258. 



CHAMELEON. 



dark red ; the tint of the skin will then be determined 

 by the color which predominates according to the im- 

 pressions of the animal. The eyes of the chameleon 



