90 



THE EVOLUTION THEOEY 



claw-like feet (F), which, partly pressed close to the head, partly 

 standing out from it, give the anterior end of the caterpillar the 

 appearance of two terminal buds, while various little pointed, knot- 

 like warts, scattered over the body, represent the sleeping buds of the 



Fig. 17. Caterpillar of Sehnia tetrahmaria , seated on a birch twig. K, head. F, feet. 

 m , tubercle, resembling a ' sleeping bud ' ; nat. size. 



little twig. AVho has not at one time or other taken such a cater- 

 pillar for a little branch, and not inexpert observers only, but even 

 trained naturalists? Many a time I have not been able to make 

 quite sure of what I had before me until I touched it ! 



