36 STEUCTUEE OF ADULT INSECTS. THE IMAGO. 



1st. That the hody is composed of Tings ^ and 



2d. That these rings are gathered into three }oortions 

 or segments, called, 1, Head ; 2, Thorax ; 3, Abdomen, 

 and all the special parts of the body, as mouth, eyes, an- 

 tennae, legs, wmgs, ovipoiitors, &c., are arranged accord- 

 ing to t]ie work they have to do, on one or the other of 

 these three parts. 



STYLOPIZED AXDEENA. 



The entire body is covered with a skin or crust, that 

 in some resembles horn or shell, and in others leather, 

 parchment, or even thin membrane. 



This rind or covering is not the same in composition 

 to the hair, skin, nails or shell of the higher animals, and 

 it seems to concentrate within itself all the active prin- 

 ciples of the 2)lants the insect feeds upon. 



It is developed into a variety of forms on the same in- 

 sect, e. g., into skin, hair, scales, shell, ring membranes, 

 &c., according to the part of the body on which it is 

 found. 



In the abdomen, and sometimes in the thorax, the 

 rings of the body are separated from each other by a 

 thin skin or membrane, but in the head, and also at 

 times in the thorax, they are merged together. 



