RELATIONS AND DIVISIONS OF THE CLASS INSECTA. 15 
sects, Walking-stick Insects, Grasshoppers, Crickets) ; 
6. Corrodentia (White Ants, Psocidce, Bird Lice) ; 
7. Thijsanoptera ( Thrips and its allies) ; 8. Rhynchota 
= Hemiptera (including Heteroptera, Homoptera, and 
ordinary Lice (Pediculidce) ; 9. Neuroptera (Ant Lion, 
Lace Winged Fly, &c.) ; 10. Panorpatce (Scorpion 
Flies); 11. Trichoptera (Caddis Flies) ; 12. Lepidop- 
tera (Butterflies and Moths) ; 13. Diptera (Two- 
winged Flies); 14. Siphonaptera = Aphaniptera (Fleas) ; 
15. Coleoptera (Beetles) ; 16. Hymenoptera (Gall Flies, 
Saw Flies, Ants, Bees, &c.). The Strepsiptera are 
included by Brauer in this system under the Coleop- 
tera; Professor Westwood, however, is still of opinion 
that they should be retained as a separate order ; no 
one, apparently, now recognizes the Achreioptera as 
distinct from the Coleoptera. 
