CLASSIFICATION AND ORIGIN OF INSECTS 1403 



5. ORTHOPTERA . . Grasshoppers, Crickets, Cockroaches, etc. 



6. Thysanoptera . Thrips. 



7. NEUROPTERA . . Ephemeras, etc. 



8. Trichoptera . . Phryganea. 



9. DIPTERA . . . Flies and Gnats. 



10. Aphaniptera Fleas. 



11. HETEROPTERA . Bugs. 



12. HOMOPTERA . . Aphis, Coccus, etc. 



13. LEPIDOPTERA . . Butterflies and Moths. 



Of these thirteen orders, the eight which I have 

 placed in capital letters namely, the first, third, 

 fifth, seventh, ninth, eleventh, twelfth, and thirteenth 

 are much the most important in the number and 

 variety of their species; the other five form compara- 

 tively small groups. The Strepsiptera are minute 

 insects, parasitic on Hymenoptera: Rossi, by whom 

 they were discovered, regarded them as Hymenop- 

 terous; Lamarck placed them among the Diptera; 

 by others they have been considered to be most closely 

 allied to the Coleoptera, but they are now generally 

 treated as an independent order. 



The Euplexoptera or Earwigs are only too fa- 

 miliar to most of us. Linnaeus classed them among 

 the Coleoptera, from which, however, they differ in 

 their transformations. Fabricius, Olivier, and La- 

 treille regarded them as Orthoptera; but Dr. Leach, 

 on account of the structure of their wings, consid- 

 ered them as forming the type of a distinct order, 

 in which view he has been followed by Westwood, 

 Kirby, and many other entomologists. 



The Thysanoptera, consisting of the Linnaean 

 genus Thrips, are minute insects well known to gar- 

 deners, differing from the Coleoptera in the nature of 



