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MODERN SYSTEM. 
Order VIII. Hemiptera. IX. Omoptera. 
Century II. MEDAMOPTERA. 
Insects without wings or elytra. 
Order X. Aptera. 
Century III. GYMNOPTERA. 
Insects with wings but no elytra. 
Cohors I. Glossostomata. 
Mouth with a spiral tongue. 
Order XI. Lepidoptera. 
Cohors II. Gnathostomata. 
Moxtth with maxillae and lip. 
Order XII. Tbichoptera. 
Cohors III. Odontostomata. 
Mouth with mandibles, maxillae, and lip. 
Order XIII. Neuroptera. XIV. IIymejjoptera. 
Cohors IV. Sipiionostomata. 
Mouth tubular, formed for sucking. 
Order XV. Diptera. 
As the above arrangement 
adopt that since given by the 
Miscellany. 
is subject to various objections, I sha^ 
same author in vol. iii. of his Zoologic a 
Class V. INSEC TJ. 
Subclass I. AMETABOLIA. 
Insects undergoing no metamorphosis. 
Order I. Thysanura.— Tail armed with setae. 
Order II. Anoplura. — Tail without setae. 
Subclass 2. METABOLIA. 
Insects undergoing metamorphosis. 
Order III. Coleoptera.— Wings two, transversely folded, covert 
by two crustaceous or hard coriaceous elytra, meeting (generally) » 
a straight suture. Mouth with mandibles. (Metamorphosis incomplete 
