26 THE INSECT WORLD. 



a general idea may be formed of what is meant in zoology by the 

 word "insect." 



Insects, whose general organisation we have briefly traced, have 

 been classed by naturalists as follows : — 



1. Aptera (Fleas and Lice). 



2. DiPTERA. (Gnats, Flies, &c.) 



3. Hemiptera (Bugs, &c.) 



4. Lepidoptera (Butterflies and Moths). 



5. Orthoptera (Grasshoppers, Crickets, Cockroaches, &c.) 



6. Hymenoptera (Bees, Wasps, &c.) 



7. Thysanoptera ( Thrips cerealuim). 



8. Neuroptera {Libellula, or Dragon-lly ; Ephemera^ or May-fly ; 



Phryganea, or Alder-fly). 



9. Coleoptera (Beetles). 



We shall commence the history of the various orders by examin 

 ing the Aptera. 



