i.J METAMORPHOSES OF INSECTS. 3 



placed them in capital letters. As regards the other 

 five there is still much difference of opinion. It must 

 also be observed that Prof. Westvvood omits the 

 parasitic Anoplura, as well as the Thysanura and 

 Collembola. 



ORDERS OF INSECTS ACCORDING TO WESTWOOD. 



1. HYMENOPTERA . Bees, Wasps, Ants, &c. 



2. Strepsiptera . . Stylops, Zenos, &c. 



3. COLEOPTERA . . Beetles. 



4. Euplexoptera . . Earwigs. 



5. ORTH.OPTERA . . Grasshoppers, Crickets, Cockroaches, &c. 



6. Thysanoptera . . Thrips. 



7. NEUROPTERA . . P^phemeras, &c. 



8. Trichoptera . . Phryganea. 



9. DIPTERA . . . Flies and Gnats. 



10. Aphaniptera . . Fleas. 



11. HETEROPTERA . Bugs. 



12. HOMOPTERA . . Aphis, Coccus, &c. 



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 comparatively 

 small groups. The Strepsiptera are minute insects, 

 parasitic on Hymenoptera : Rossi, by whom they 

 were discovered, regarded them as Hymenopterous ; 

 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 familiar 

 to most of us. Linnaeus classed them among the 



B 2 



