30 ON THE CLASSIFICATION OF INSECTS. 



found in forms, we may proceed with a degree of certainty ; and when forms are correctly 

 denned, we may escape most of the graver errors in the formation of groups. 



I do not propose to enter into the details of the principles of classification in this place, 

 but shall proceed at once to the modes which have been proposed and followed by the 

 principal English entomologists. 



The first classification is that of Stephens, in which the first grand division of the insect 

 kingdom is into two subclasses : 



FIRST SUBCLASS : MANDIBULATA. SECOND SUBCLASS : HAUSTELLATA. 



Order 1. Strepsiptera. Order 1. Hemiptera. 



2. Orthoptera. 2. Homoptera. 



3. Neuroptera. 3. Lepidoptera. 



4. Dermaptera. 4. Diptera. 



5. Trichoptera. 5. Homaloptera. 



6. Hymenoptera. 6. Aphaniptera. 



7. Aptera. 



Insects are classed by Westwood in the following manner : 



FIRST SUBCLASS : DACNOSTOMATA. SECOND SUBCLASS : ANTHOSTOMATA. 



( Moulh wilh jaws.) ( Mouth wilh a sucker.) 



Order 1. Hymenoptera. Order 1. Diptera. 



? Osculant Order Strepsiptera. Osculant Order Homaloptera. 



Order 2. Coleoptera. 



Osculant Order Euplexoptera. Osculant Order Aphaniptera. 



Order 3. Orthoptera. Order 2. Heteroptera (including the water- 



? Strepsiptera? tugs). 



Order 4. Neuroptera. Order 3. Homoptera. 



Order 5. Trichoptera ( Phryganea alone). Order 4. Lepidoptera. 



