THE ORDERS OF INSECTA. 



271 



12, Thysanoptera, among them ; 15, Isoptera or Termites ; 16, 

 Corrodeutia limited to Psocidae ; 17 to 25 call for no remark ; 

 26 consists of the forms allied to Sialis and Chauliodes ; 27 in- 

 cludes only Kapliidiidae ; 28 consists of Hemerobiid forms ; of 

 29-35 it is only necessary to remark that the name Suctoria is 

 applied to the fleas. 



For Haudlirsch's purposes it was desirable to adopt more 

 Orders than are perhaps really necessary from the morphological 

 and developmental points of view, and I think the following list 

 may be considered sufficiently ample at the present day, viz. : — 



Wingless insects whose ances- 

 tors were probably winged. 



The Orders Arranged. 

 Apteeygota. 



1. Collembola \ 



(or Apontoptera or Synaptera). | Wingless insects supposed to 



2. Campodeioidea. V have descended from wiug- 



3. Thysanura 1 less ancestors, 

 (or Aptera). 



Anapterygota. 



4. Mallophaga 



(or Lipoptera). 



5. Anoplura 



(or Ellipoptera). 



6. Siphonaptera 

 (or Aphaniptera). 



Exopterygota. 



7. Orthoptera. 



8. Plecoptera. 



( = Perlaria.) 



9. Psocoptera. 



( = Corrodentia.) 



10. Isoptera. 



( = Termites.) 



11. Embioptera 



(or Embioidea). 



12. Ephemeroptera. 



( = Plectoptera.) 



13. Odonata 



(or Paraneuroptera). 

 11. Thysanoptera. 

 • 15. Hemiptera. 



Endopterygota. 



16. Neuroptera. 



(=:Planipennia.) 



17. Trichoptera. 



18. Lepidoptera. 



19. Coleoptera. 



20. Strepsiptera. 



21. Diptera. 



22. Hymenoptera. 



Winged insects whose wings 

 develop outside the body. 



Winged insects whose wings 

 arise as invaginations of 



■ the hypodermis, and for a 

 time project within the 

 body. 



