326 



ANIMAL BIOLOGY 



on the lava fields of volcanic regions are dark gray, while those 

 of the great stretches of sand plains are white — the same species 

 exhibiting regional variations in color which blend with the sur- 

 roundings. Furthermore, the same individual may vary in color 

 with the seasonal changes in its environment, or present different 

 color schemes in different localities. Thus the summer coat colors 



Fig. 210. — Underwing Moth. A, wings expanded, exposing the highly 

 colored hind wings; B, resting on bark. (From Folsom.) 



of the Arctic Fox and the Weasel harmonize with the browns of 

 rocks; and the winter coat of white, with snow-clad nature. And 

 the Chameleons are by no means unique in their ability to change 

 color very rapidly in response to that of their immediate surround- 

 ings. (Fig. 81.) 



But confusion is worse confounded when to harmonizing color 

 is added harmonizing form, striking examples of which are the 

 Leaf Butterflies of the East Indian region, the familiar Walking- 



