CLASSIFICATION OF INSECTS. 117 



SUB-CLASS B. 



The small remaining section, consisting of Insects which un- 

 dergo no metamorphosis, and are destitute of wings, includes 

 three orders. 



Order X. ANOPLOURA (Louse). These are distinguished from 

 the succeeding, by the absence of appendages to the abdomen, 

 and by the suctorial nature of the mouth. 



Order XL MALLOPHAGA (Bird-lice). In these the abdomen 

 is also destitute of appendages, but the mouth is formed for biting. 



Order XII. THYSANOURA (Spring-tails, fyc.). In these the 

 abdomen is furnished with appendages, adapted for leaping. 



Besides these principal groups, there are some small interme- 

 diate orders, by which the former are connected. These are not 

 admitted, however, by all Entomologists. Thus the JEarwig 

 tribe, which combines, in some degree, the characters of the 

 Coleoptera and Orthoptera, is raised by many to the rank of a 

 distinct order DERMAPTERA, which leads from the first to the 

 second order. Again, a separate order TRICHOPTERA, has 

 been formed to include the Caddice-fties, which are intermediate 

 between the Lepidoptera and Neuroptera. And, lastly, there is 

 a small group STREPSIPTEKA, or RHIPIPTERA which appears to 

 be very closely allied to the Beetles, if indeed the Insects be- 

 longing to it, which are all parasitic upon different species of 

 Bees and Wasps, are not really members of the order Coleoptera. 



SUB-CLASS A. 

 METABOLA ; or Insects undergoing a Metamorphosis. 



ORDER I. COLEOPTERA, OR BEETLES. 



696. The insects composing this Order, all of which are known 

 under the common name of Beetles, are amongst the most numer- 

 ous and best known of the whole class. The singular forms and 

 brilliant colours exhibited by mftny of the species, the size of their 

 bodies, the solid texture of their integuments, which facilitates 

 their preservation, and the nature of their habits, which makes 

 their capture more easy, have combined to render them an ob- 

 VOL. n. K 



