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 cereaiium). 



8. NEUROPTERA (Libellula, or Dragon-fly ; 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. 



