BOOK FOURTEENTH 



INSECTA. 



CLASSIFICATION. 



§ 321. 



As anatomists have been able to examine, with few exceptions, nearly 

 all the orders and families of the Insecta, their anatomical researches have not 

 been restricted, as in the preceding classes, to isolated genera or species, 

 but have embraced entire families. With such abundant materials, we 

 should go beyond the limits of our work in enumerating here all the genera, 

 or even all the families, whose organization has been studied. 



A. Insects without Metamorphosis. 



[hisecta ametabola.) 



ORDER I. APTERA. 

 Families : Pediculidae, Nirmidae, Poduridae, Lepismidae. 



B. Insects with incomplete Metamorphosis. 



{Insecta kemimetabola.) 

 1. Mouth Suctorial, 



ORDER II. HEMIPTERA. 



Families : Coccidae, Aphididae, Psyllidae, Cicadidae, Cercopidae, 

 Naucoridae, Nepidae, Coreidae, Pentatomidae. 



2. Mouth Mandibulate. 



ORDER III. ORTHOPTERA. 



Families : Physopoda, Forficulidae, Psocidae, Perlidae, Ephemeridae, 

 Libfxlulidae, Termitidae, Acrididae, Locustidae, Achetidae, Phas- 

 midae, Mantioak, Blattidae. 



