228 



THE UNIVERSE. 



the young larviie, in order to nourish themselves, scoop out 

 all the little galleries which branch out from the whole 

 length of the parent nook. It is towards the extremity of 

 these that they undergo their metamorphosis, and when 

 their arrival at the state of the perfect insect takes place, 

 and the desire to breathe the pure air comes upon them, 

 these insects bore through the bark, and scatter them- 

 selves abroad. 



13S. Cone Pyralis — Tortrix Strohiliana. Caterpillar and Butterfly, enlarged and 



of natural size. 



Sectiou of Fir Cone, made to display the work ot the Caterpillar. 



Of all these Avood-cutters, the Typographer Bostrichus 

 is reo'arded by M. Ratzeburg as the most dangerous. He 

 says that it ravages the forests of fir-trees in such a 

 manner, that often not a single tree escapes its attacks. 

 It is doubtless in order to give an idea of the extent of its 

 depredations, that this naturalist has bestowed on such a 

 little insect the alarming name of the "great pine-gnawer." 



