138 MODERN SYSTEM. 



Order VIII. HrMiPTERA. IX. Omoptlra. 



Century II. MEDAMOPTERA. 

 Insects without wings or elytra. 

 Order X. Aptera. 



Century III. GYMNOPTERA. 

 Insects with wings but no elytra. 



Cohors T. Glossostomata. 

 Mouth with a spiral tongue. 

 Order XI. Lepidoptera. 



Cohors II. Gnathostomata. 

 Mouth with maxilla' and lip. 

 Order XII. Triciioptera. 



Cohors III. Odqntostomata. 

 ]\Iouth with mandibles, maxillae, and lip. 

 Order XIII. Neuroptera. XIV. IIymenoptera. 



Cohors IV. SrPH0^•0ST0MATA. 

 Mouth tubular, formed for sucking. 

 Order XV. Diptera. 



As the above arrangement is subject to various objections, I shall 

 adopt that since given by the same author in vol. iii. of his Zoologieal 

 Miscellany. 



Class V. IN SECT A. 



Subclass I. AMETABOLIA. 



Insects undergoing no metamorphosis. 

 Order I. Tiiysanura. — Tail armed with setae. 

 Order II. A^oPLURA. — Tail without setae. 



Subclass 2. METABOLIA. 

 Insects undergoing metamorphosis. 



Order III. Coleoptera. — Wings two, transversely folded, covered 

 by two crustaccous or hard coriaceous elytra, meeting (generally) with 

 a straight suture. Mouth with mandibles. {Meta/nvqilivsisincomi^letc.) 



