THE ANIMAL KINGDOM. 



225 



species owes its name of pine-twister, by which the for- 

 esters generally designate it. 



Some destroyers, instead of this openly declared war, 

 operate silently and in the shade; these are concealed 

 enemies, which nothing can track, and we do not suspect 

 their presence till they have slain their victim. Some 



1-34. The Bud-twister — Tortrix Turionana (Ratzeburg). 

 CateriDillar and Butterfly, enlarged and of nat. size- 



live on wood and hollow out ample tortuous galleries in 

 it, Avhich very speedily modify the organism of the tree so 

 profoundly, that the strongest succumb to it. Others work 

 between the bark and the sap-wood, using up materials 

 that offer less resistance to their teeth. 



In the former category must be placed the Cossi, en- 

 thusiastic carpenters of which we have already made 

 mention. Another, again, is the Oak Bombyx, the cater- 

 pillar of which is accustomed to follow a straightforward 



S8 



