STEUCTU15E AND CLASSIFICATION 



INSECTS 



CHAPTEE I. 



The Order of Insects belongs to the Articulates — the 

 fourth type of the animal kingdom {Protozoa, liadiates, 

 JIoHusks, Articulates, Vey^tehrates) — since they, as well 

 as all the other members of this type, have their bodies 

 formed of rings built around a central chain of nerve 

 bunches. 



Of the three classes of Articulates ( W^orrns, Crustacea 

 and Insectlans) the insects belong to the third, that of 

 Insectians, in most of which, the rings of the body are 

 gathered into three portions, called the head, the thorax, 

 and the abdomen. 



The class of Insectians comprises three orders : 



1st. The Myriapods, having many legs, and the thorax 

 and abdomen not distinctly separable, coirprising such as 



