198 Cr.AMMAU OF EN'TOMOI.OGY. 



CHAPTER IV. 



ON THE CLASSIFICATION OF HYMENOPTERA. 



700. The metamorphosis in the third class, 

 Hymenoptera, is necromorplious. The larva bears 

 no resemblance to the imago ; it has small corneous 

 mandibles, moving horizontally ; in seven orders, 

 with six articulate, and twelve to sixteen pre- 

 hensile, feet ; in the remaining orders, without 

 feet. Pupa perfectly quiescent, having the organs 

 of locomotion and manducation confined by a 

 shell-like skin ; yet displaying all the limbs and 

 organs, placed in order by the sides of the body, 

 and detached from it, except at the usual points of 

 connexion. 



701. Imago with the mandibles strong, moving 

 horizontally, and masticatory ; the other organs of 

 the mouth fully developed ; three ocelli ; wings 

 all developed, the fore exceeding the hind wings 

 in size, membranaceous, and used in flying ; the 

 mesothorax largely developed at the expense of the 

 pro- and metathorax ; the podeon mostly re- 

 stricted ; the tarsi five-jointed. Food very various. 



