INSECT BECOMING WINGED. 75 



it begins to eat under the bark ; and in this 

 stage it commits the greatest depredations, and 

 soon becomes a good sized maggot. I am 

 inclined to think from my discoveries this sea- 

 son, that the cold weather does not much affect 

 them; for although we had much severe 

 weather, from Christmas, 1822, to March, 1823, 

 in the latter month, when I came to examine the 

 trees where they were cankered, I found 

 several which, had left the skin quite lively, and 

 could see where they had been recently feed- 

 ing ; and others with their heads just coming 

 out of the skin ; they adhere by their head to 

 the tree, and if you remove them gently, they 

 hang by a web to keep themselves from falling, 

 and unless you examine them, you would sup- 

 pose them nothing more than small morsels 

 of dead leaf or bark. 



THE THIRD CHANGE OF THE INSECT, AND ITS 

 BECOMING WINGED. 



Par. 88. The maggot, having grown to the 

 size of about two-thirds of an inch, looks out for 

 a convenient place in the tree, and after discharg- 

 ing a quantity of excrement, it forms itself into 

 a chrysalis, and remains torpid for'some time, 

 when it quits the chrysalis, or shell; it then 

 becomes the winged fly, and commences breed- 

 ing as before described, after which it dies. 



E-2 



