^6 CLASS INSECTA. 



The first order, the Myriapods, has more than six feet, 

 (twenty-four and upwards,) disposed through the whole 

 length of the body on a series of rings, each of which have 

 one or two pairs, and the first of which, and in many the 

 second too, seem to constitute part of the mouth. They are 

 apterous. 



The second order, the Thysanura, has six feet, and the 

 abdomen furnished on the sides with mobile pieces in the 

 form of false feet, or terminated by appendages proper for 

 leaping. 



The third order, the Parasites, (Parasita,) has six 

 feet, wants wings, has for visual organs smooth eyes ; their 

 mouth is, in a great degree, internal, and consists only in a 

 muzzle enclosing a retractile sucker, or in a cleft situated 

 between two lips, with two crochet-formed mandibles. 



The fourth order, The Suckers, (Suctoria,) have six 

 feet, want wings ;* their mouth is composed of a sucker en- 

 closed in a cylindrical sheath of two articulated pieces. 



The fifth order, the Coleoptera, has six feet, four wings, 

 of which the two upper are case-formed, mandibles and jaws 

 for mastication ; the lower wings folded, simply across, and 

 the crustaceous cases always horizontal. They undergo a 

 complete metamorphosis. 



The sixth order, the ORTHOPTERA,t has six feet ; four 

 wings, of which the upper two are case formed ; mandibles 

 and jaws for mastication (covered at the extremity by a 



• They undergo metamorphoses, and acqviire locomotive organs which 

 they did not possess at their birth. This character is common to the fol- 

 lowing orders, but in the insects under consideration the metamorphosis 

 developes another sort of locomotive organs, the wings. 



-f- De Geer had established this order, and given it the name of dermoj)- 

 tera, which Olivier has changed, not much to the purpose, into that of 

 orthoptera. We preserve, however, this last, because French naturalists 

 have generally adopted it. 



