138 MODERN SYSTEM, 



Order VIII. IIemiptera. IX. Omoptera. 



Century II. MEDAMOPTEILV. 



Insects witliout wings or elytra. 

 Order X. ApTEn^. 



Century III. GYMNOPTEllA. 

 Insects with wings but no elytra. 



Cohors I. Glossostomata. 

 Mouth with a spiral tongue. 



Order XI. Lepidoptera. 



Cohors II. Gxatuostomata. 

 Mouth with maxilliE and lip. 

 Order XII. Triciioptera. 



Cohors III. Obontostomata. 

 Mouth with mandibles, maxillffij and lip. 



Order XIII. Neuroptera. XIV. IIyjiekoptera. 



Cohors IV. Siphonostomata. 

 Mouth tubular, formed for sucking. 

 Order XV. Diptera. 



As tlie above arrangement is sidycct to various ol)jections, I shall 

 adopt that since given by the same ailthor in vol. iii. of his Zoological 

 Miscellany. 



Class V. IN SECT A. 



Subclass I. AMETABOLIA. 

 Insects undergoing no metamorphosis. 



Order I. Thysanura. — Tail armed with seta;. 

 Order II. Anoplura. — Tail without setas. 



Subclass 2. METABOLIA. 

 Insects imdergoing 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. (ilfcto«o/y/iOS« incomplete.) 



