CLASS V. fNSECTA. 137 



Cohors I. Odontat A. 

 Mouth with mandibles, maxillae, and lip. Wings four. 



Order IV. — Xeuroptetia. ^'. Hymenoptfua. 

 Cuhors TI. SiPuoNOSTOMA. 

 Mouth tubular, formed for sucking. 

 Order VI. Li.pidoptera. VII. Diptera. VIII. Suctoria. 



Latrcillc has retained the same general arrangement in his last work, 

 C msidcrutions G'cnirales sitr I'Or'Jrc Xafurct/c, t^r . but he has rejected Uie 

 divisions into Legions, Centuries, and Cohorts. 



D\imcn\, in h\s Zon/ogie jlii(ih/ti(jur, arranges insects into Eight Or- 

 ders, the last of which also couiprchcnds the Classes Aruclindidu and 

 yiiirhipoda. 



In 1^X2 Lamarck published a little work, entitled F.xtruitdu Coursde 

 Zooloeie du Museum d'lUstoirc i\aturellr, in which he has continued the 

 general arrangement pidjjishcd by him in 180L 



In 1815, vol. ix. of the Edinburgh Enci/c/optedia was published, in 

 which Dr. Leach gave the following arrangement of Insects into Or- 

 ders, and has added to them the I'aras'Ua and Tlii/sanoura, whicJi La- 

 ireille jtlaccd with the Arachiwidu. 



Subclass I. AMET.ABOLIA. 

 Order I. TiiYSAXURA. II. Axopiura. 



Subclass II. METABOLIA. 



Century I. ELYTHROPTER.^. 

 Insects with elytra. 



Cohors^I. Odoxtostomata. 



Mouth with mandibles. 

 * Metamorphosis incomplete. 

 Order III. Coleoptera. 



** Metamorphosis ncarlj/ coardate. 

 Order IV. Strepsiptera. 



*** Metamorphosis semi-complete. 

 Order V. Dermaptera. VI. Orthoptera. VII. Dictyoptera. 



CohorS II. SiPHONOSTOMATA. 



INIouth with an articulated rostrum. 



