CLASS V. IX3KCTA. 139 



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

 versely folded. E/j/tra siibcrustaceous, al)l)reviated, with the suture 

 straight. Mouth with mandibles. {Metamorphosis semi-comi)lcte.) 



Order \''. Ortiioptera. — Wings two, longitudinally folded, covered 

 by two coriaceous elytra, the margin of one elytron covering the same 

 part of the other. Mouth with mandibles. {Mctaiuorphosis scmi-com- 

 plete.) 



Order VI. Dictvoptera. — Wings two, longitudinally folded, twice 

 or more, covered by two coriaceous elytra; one elytron decussatin<'- 

 the other obli(|uely. Mouth with mandibles. {Metamorphosis semi- 

 complete.) 



Order VII. IIemiptep.a. — n7;/^s two, covered by two crustaccous 

 or coriaceous elytra (the tips, of which arc generally membranaceou!^), 

 horizontal, one decussating the other obliquely. Mouth wilh an arti- 

 culated rostrum. {Metamorphosis semi-complete.) 



Order \'III. Omoptera. — Wings two, covered by two elytra which 

 are entirely coriaceous or membranaceous ; meeting obliquely with a 

 straight suture. Mouth with an articulated roslnun. {Melainorphosis 

 semi-complete or incomplete.) 



Order IX. Aptera. — No zcings or elytra. Mouth with a tubular 

 jointed sucking rostrum. {2!etamo?phosis incomplete.) 



Order X. Lepidoptkra. — Wings four, membranaceous, covered wiiii 

 meal-like scales. Mouth with a spiral tongue. {Mctuinorpliosis incom- 

 plete.) 



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

 gostia or wing bones hairy. Mouth w'ilh. maxilkt and lip. {Metamor- 

 phosis incomplete.) 



Order XIT. Neuroptera. — Wings four, membranaceous, generally 

 of e(jual size, with numerous decussating pterigostia resembling a net- 

 work. Mouth with mandibles, maxilke, and lip. {Mttamorphosis in- 

 complete or semicomplete.) 



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

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

 so as to resemble a net-work. Mouth witli mandibles, maxilltc and lip. 

 ,' Melainorphosis incomplete.) 



Order XIV. Rhipiptera. — Wings two, longitudinally folded. Mouth 

 with mandibles. {Metamorphosis subcoarctate.) 



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

 their base. Mouth tubidar, formed, for sucking. {Metamorphosis in- 

 complete or subcoarctate.) 



Order XVI. Omaloptera. — Mouth furnished wilh mandibles and 



