-66— 



The simple character given above — with or without antennge — will 

 enable any one to place at a glance any insect in its proper group. The 

 groups Pediculma, Mallophaga and Physopoda (= Thysanoptera, Hal.), 

 therefore belong naturally to the orders originally assigned them by Bur- 

 meister : the former, on account of their promuscidate mouth, go with 

 the Hemiptera ; and the two last, on account of their mandibulate mouth 

 and active pupa, go with the Orthoptera. 



The following diagram, will demonstrate the relative position, that 

 it is believed the different orders should occupy in a natural scheme, and 

 it may be well to compare it with a similar one, in the "Third Report of 

 the U. S. Entomological Commission," page 295, to see how different is 

 our conception of a natural arrangement, from that entertained by its 

 learned author. Dr. A. S. Packard. 



INSECTS GENEALOGICAL TREE. 



Lepidoptera 

 Neuroptera 



Hymenoptera Arachnida 



Diptera Pedipalpi 



Coleoptera 



Hemiptera 



Orthoptera 



Thysanura 



Myriapoda 



Acarina 



Tardigrada 



Linguatuiina 



CERATA 



ACERATA 



A classification is at once demonstrated to be either good and 

 natural, or false and artificial ; and its merits are soon recognized. 



The good and natural is accepted ; the false and artificial eliminated 

 or rejected. 



It is not thought advisable, therefore, at this time, to enter into the 

 merits or demerits of the many different classificatory schemes proposed 

 for the arrangement of the He7niptera ; they are familiar to all students 

 and nothing is ever accomplished by such discussions. 



The following is our proposed arrangement of the Divisions and 

 Families : 



