C2 INTERNAL ANATOMY OF THE IMAGO. 



we can here present in relation to the third department, 

 or that of classification, is the character of each of the 

 seven sub-orders, and a table of its subdivisions into 

 families, and sometimes also, its genera. 



Having progressed so far in the general observation of 

 the life and appearance of an insect, the student is now 

 prepared to study the relations and names that have 

 been assigned to it by its first describcrs, on account of 

 its resemblances to and differences from other insects in 

 these details of structure. 



This study is called the Classification of Insects, or 

 Systematic Entomology. 



