144 



ANIMAL COLORATION. 



movemeats common to most infuriated beasts, but by changes 

 of colour. So, too, does the cuttlefish. 



The power of changing its colour to suit the environment is 

 not confined to the chameleon, but is found in other lizards. 

 According to Drs. Elliott Coues and Yarrow, species of the 

 genus Phrynosoma, (the " Horned Toads "), Uta, and Sceleporus 

 have a like power. With regard to UtM symmetrica Dr. Coues 



Fig. 13.— The Horned Toad (Phi-T/iiosoma). 



wi'ites (loc. cit., p. 597) : " Out of great numbers of specimens 

 procured in one locality . . . and unquestionably the same 

 species, almost the only colour mark common to all was the 

 pale yellow throat. Some were plain silvery white below, 

 others were bright greenish-olive on the belly. Above, the 

 colour ranges from a deep greyish-black to a dull greyish- 

 brown with dark lateral streak. I satisfied myself that the 

 same individual assumed these different colours according to 

 the kind of rocks it happened to be upon. The blackish 



