PROTECTIVE RESEMBLANCE, WITH EXAMPLES 105 



foliage of the tree. Here tliey live during the remainder of 

 their existence unless devoured by some predaceous enemy. 



This katydid, like its related forms, is of particular interest 

 in showing special adaptations to an arboreal existence. It 

 affords one of the most beautiful examples of protective resem- 

 blance found in our temperate favma. 



The Invisible or Thread-Legged Bug 



E called attention in another chap- 

 ter to the thin-bodied walking- 

 stick insect. The efEcacy of his 

 attenuated form is at once seen 

 to be of use in concealing his 

 body from his enemies. It will 

 be remembered that the walking- 

 stick is a member of the Orthop- 

 tera or grasshoj}per order. Among 

 bugs we have a parallel case, 

 where natural selection seems to 

 have effected the same object of attenuation of bodj', but even 

 to a more marvellau.s degree. I refer especially to the invisible 

 or thread-legged bug which is portrayed above. It certainly 

 occupies a place among the quaintest of the insects. In our 



