Appendix. 545 



tainly cannot assert that to our eyes in broad daylight the 

 resemblance is very striking. But the pupa? hang among 

 the shadows of the leaves, and a less perfect imitation 

 may deceive foes that are not so sharp-sighted; pro- 

 tective resemblance must commence moreover with an 

 imperfect degree of imitation." 



x n 



