208 



NORTH AMERICAN INSECTS. 



erpillars proceeding from these eggs are very injurious to 

 vegetation ; and it is not uncommon to see more than twen- 

 ty of them on a single stem of carrot or celery. These lar- 

 vae are generally known under the name of Parsley worms, 

 and may easily be destroyed. They are smooth-bodied, and 

 of a bright-green color. These caterpillars may also be col- 

 lected and raised without trouble, except that many of them 

 are stung by ichneumon wasps, which deposit in each an 

 egg, the maggot of which feeds on the flesh of the caterpil- 

 lar without touching any vital part or preventing its trans- 

 formation into a cocoon. After this metamorphosis the 

 maggot consumes all that remains of the embryo butterfly, 

 then goes through its own transformation, and, instead of 

 the butterfly, comes out a perfect ichneumon wasp (Fig. 

 C7). 



The Troilus [Papilio Troilus), Fig. 53, is another of 

 these celebrated knights, named by Linnaeus after King 



The Troilus. 



