CLASSIFICATION OF INSECTS. 



295 



Fig. 147. 



representatives of this order ; and the usual forms of these insects in 

 the larva, pupa, and imago state are familiar to all (fig. 148, A, B, c). 



ft. Mouths with distinct biting jaws. 



(766.) 7th Order. Hymenoptera*. Possessing four naked wings 

 traversed by ramose nervures. 

 Larvae generally without head or 

 feet, but sometimes with both. 

 Wasps, Bees, &c. 



(767.) 8th Order. Coleoptera . 

 In this last order, the anterior 

 wings are converted into dense 

 horny cases or elytra, beneath 

 which the posterior pair, adapted 

 to flight, are folded up when the 

 insect is at rest. The larvae pos- 

 sess a head, and are sometimes 

 provided with feet, but not always. 



(768.) The Coleopterous divi- 

 sion of the insect world embraces 

 the extensive tribe of Beetles, both 

 terricolous and aquatic ; of the 

 former we have an example in the 

 common Cockchafer (Melolontha), 

 of which a figure is here given, as 

 well as of the different stages of 

 its development (fig. 149, A, B, c, 



D, E)f. 



(769.) Having thus introduced 

 the reader to the chief orders com- 

 posing the vast class of Insects, 

 our next object must be to examine 

 more in detail the principles upon 

 which these animals are con- 

 structed, both as regards their external organization and the nature 

 and arrangement of their internal parts. We shall speak of them in 

 the first place only in their perfect condition, leaving all observations 



* >>p.r}v -evos, a membrane ; irrepbv, a wing. 



f It would be foreign to our present purpose to do more than enumerate other 

 O rders of Insects which have been formed by different authors. Of these, the following 

 are the most important : 



Dermaptera (Leach), Sepfia, skin ; trrepov. Earwigs (Forficula). 



Triclioptera (Leach), Opi%, rpixbs, hair ; irrepov. May-flies (Phryganea). 



Aphaniptera (Kirby), a^arr/s, invisible ; trrepov. Fleas (Pulex). 



Aptera, aTrrepos, without wings. Wingless insects. 



Parasita (Latreille). Lice (Pediculus). 



Thysanoura (Latreille), Ovtrav-ovpos, bushy-tailed. Spring-tails (Lepismenze). 



Metamorphoses of Dragon-fly. 



