CLASS V. IX3ECTA. 139 



Order IV. Dermaptera. — Wings two, longitudinally and trans- 

 versely iblded. FJyt7u subcrubtiiceous, ubljrevuUtd, wiih the suture 

 straight. Mouth with nuuidiblcs. {JMctamorp/iosis bemi-complete.) 



Order V. Orthoptera. — Wings two, longitiidintijly folded, covered 

 by two coriaceous elytra, the margin ot" one elytron covering the same 

 part of the other. Moulh with mandibles. {Mdamorphosis semi-com- 

 pleto.) 



Order \'I. DicTVOPxr.r. \. — TT7/;i's two, longitudinally folded, twice 

 or more, covered by two coriaceous elytra; one elytron decussating 

 the other obli(JuelJ^ JMouUi with mandibles. (^Metamorphosis semi- 

 oomplcte.) 



Order \'II. IIemiptih \.^TI7/?^i-.v tv.-o, covered by tv/o crustaceous 

 or coriaceous elytra (the tips of which are generally Juenibranaceous), 

 horizontal, one decussating the other obliquely. Mouth viith an arli- 

 culated rostrum. (^Metamorphosis semi-complete.) 



Order \'[1I. Omoptlra. — Wings two, covered by tsvo elytra which 

 are entirely coriaceous or membranaceous ; meeting ob]i(]ueiy with a 

 straight suture. Mouth with an articulated rostrum. (^Metamorphosis 

 semi-complete or incomplete.) 



Order IX. Aptera. — xVo rcings or elytra. Mouth with a lubular 

 jointed sucking rostrum. (^Metamorphosis incomplete.) 



Order X. Lepidopti.ra. — Wings four, membranaceous, covered w-ilh 

 meal-like scales. Moulh with a spiral tongue. (^7iIetainorphosis incom- 

 plete.) 



Order XI. Trkhoptkra. — Wings four, membranaceous; the pteri- 

 gostia or wing bones hairy. Moulh with maxilke and lip. [^Ljumor- 

 phosis incomplete.) 



Order XIT. Xei'roptj-.ra. — Tr///i;-.s- fom", membranaceous, generally 

 of equal size, with numerous decussaling pterigostia resembling a net- 

 work. Month with mandibles, maxilke, and lip. (^^htamorpliosis in- 

 complete or semicomplete.) 



Order XIII. IIymenoptera. — Wings four, memliranaceous, the 

 hinder ones always smallest; the pterigostia not decussating each other, 

 so as to resemble a net-work. Mouth with mandibles, maxilkc and lip. 

 (^JMctamorpIiosis incomplete.) 



Order XIV. Riiipiptera.- — 117//_i;.s- two, longitudinally folded. Mouth 

 with mandibles. (^Metamorphosis subcoarctate.) 



Order XV. Diptera. — Wings two, with halteres or balancers at 

 their base. Mouth tuhuhr, formed for sucking. {Met amorp/tosis in- 

 complete or subcoarctate.) 



Order XVI. Omaloptera. — Mot'lh furnished with mandibles and 



