Contents xi 



CHAPTER VI 



PAGE 



The Pedigree of Insects .... 344 



Relationships of the Insect Orders, 344-346 : Coilembola 

 and Thysanura, 346-348 ; Demaptera, Orthoptera and 

 Platyptera, 348-349 ; Thysanoptera and Hemiptera, 349- 

 350 ; Plectoptera and Odonata, 350 ; Origin of Wings, 

 350-352; Insects of Past Ages, 352-355; Origin of Meta- 

 morphosis, 356-358 ; Neuropteraand Coleoptera, 358-360 ; 

 Trichoptera and Lepidoptera, 360-361 ; Hymenoptera and 

 Diptera, 361-363; Insectscompared with other Arthropods, 

 363-373; Arthropods and Annelids, 373-374; Origin and 

 Age of Insects, 374-378. 



References to Literature . . . 379 



Index . . . . -393 



