CLASSIFICATION OF INSECTS. 333 



A. Mouth with four jaws ; elytra of uniform consis- 



tence. 



Order COLEOPTERA. Elytra crustaceous, hori- 

 zontal; with a straight suture; wings transversely 

 folded; metamorphosis complete. (Beetles.) 



Order DERM APTERA.* Elytra horizontal ; suture 

 straight ; wings folded longitudinally and trans- 

 versely : pupa complete and active. (The earwig.) 



Order ORTHOPTERA. Elytra [tegmina] coriaceous, 

 folding over each other at the tip ; wings longi- 

 tudinally folded: pupa complete and active. (Lo- 

 custs, grasshoppers, cockroaches, &c.) 



[Order THYSANOPTERA, Haliday, is probably to 

 be placed next to the Orthoptera.'] 



B. Mouth proboscidate ; pupa complete and active. 

 Order HEMiPTERA.f 



2. Gymnoptera (naked wings). 

 A. Four wings. 



a. Mouth with four jaws ; wings not farinose. 

 Order NEUROPTERA. Wings thickly reticulated; 

 the posterior as large as the anterior; no 

 exserted ovipositor, nor sting; metamorphosis 

 various. (Dragon-flies, &c.) 

 [Order TRICHOPTERA, Kirby, is here to be in- 

 troduced, forming part of the Neuroptera, ac- 

 cording to Latreille. (Caddice-flies.)] 

 Order HYMENOPTERA. Wings with large areas; 



* This term has been completely misapplied by English entomologists, 

 having been originally proposed for the Cimicid<e. 1 have, therefore, em- 

 ployed the term Euplexoptera in its stead for the earwig. 



t In most of his works, Latreille has separated the rostrated Hemi- 

 ptera of Linnaeus into two orders Hemiptera (Cimex, &c.), and Homo- 

 ptera (Cicada, &c.), the characters of which are at least as important as 

 those which separate the earwig from the grasshoppers. 



