CHIEF ENTOMOLOGICAL CLASSIFICATIONS AND SYSTEM?. (515 



11. Insects with metamorphosis. Metabola. 

 A. With mandibles and wing cases. 



a. Metamorphosis imperfect (perfect). 



Wings folded transversely. 3. Order. Coleoptera. 



b. Metamorphosis half perfect. 



Wings folded longitudinally and 



transversely. 4. 



Wings folded longitudinally. 



With a straight suture. 5. 



Crossed at the apex. (?. 



B. With setiform mandibles for punc- 



turing. 

 Wings crossing at the apex. 7* 



Wings straight, contiguous. 8. 



C. With setiform mandibles and with- 



out wings. 9. 



Dcrmaptera 

 (Forficula). 



Ortlioptera. 

 Dictyoptera 

 (Blallurid}. 



Hemiptera 



(bugs). 



Omoptera 



(Cicada). 



Aptera 

 (Suctoria, Lat.). 



D. With indistinct mandibles, connate 



at the base. 



Wings covered with scales. 10. 



Wings generally hairy. 11. 



E. With mandibulate mouths, but with- 



out wing cases. 



Lcpidoptera. 

 Trichoptera 

 (Phryganea). 



a. With simple foot claws. 15. Diptera. 



b. With divided foot claws. 16. Omaloptera 



(Diptera pupipara). 



The subdivision of insects into many orders, which the English are 

 especially fond of, certainly merits no recognition ; only where nature 

 has set true limits let them be divided, and let us not wilfully destroy 

 the beautiful picture of harmony she everywhere presents us with. 

 How, for instance, will the author justify the separation of the 

 Orthoptera into three orders; and how the separation of the Trichoptera 

 and Neuroptera by these principles ; and how the division of the 



