CLASS V. 1NSECTA, 
137 
Cohors I. Odontata. 
Mouth with mandibles, maxillae, and lip. Wings four. 
Order IV. — Neuroptera. V. IIymexoptera. 
Cohors II. SmiONOSTOMA. 
Mouth tubular, formed for sucking. 
Order VI. Lepidoptera. VII. Diptera. VIII. Suctoria. 
Latrcillehas retained the same general arrangement in his last work, 
Considerations Gem-rales sur FOrdre Nalurellc, fye. but he has rejected the 
divisions into Legions, Centuries, and Cohorts. 
Oumeril, in his Zoologie Analyiupue, arranges insects into Eight Or- 
ders, the last of which also comprehends the Classes Arachnoida and 
Myriapoda. 
In 1812 Lamarck published a little work, entitled Extrait du Cours de 
Zoologie du Museum d’Hktoire Nuturelle, in which he has continued the 
Seneral arrangement published by him in 1801. 
in 1815, vol. ix. of the Edinburgh Encyclopedia was published, in 
''inch Dr. Leach gave the following arrangement of Insects into Or- 
1 e rs, and has added to them the Parasita and Thysanvura, which La- 
tr eille placed with the Arachnoida. 
Subclass I. AMETABOLIA. 
Order I. Thysanup.a. II. Anopltjra. 
Subclass II. METABOLTA. 
Century I. ELYTHROPTE11A. 
Insects with elytra. 
Collars I. OllOlv TOS'l om ata . 
Mouth with mandibles. 
* Metamorphosis incomplete, 
Order III. Coleoptera. 
** Metamorphosis nearly coarctate. 
^Mer IV. Strepsiptera, 
*** Metamorphosis semi-complete. 
Order v. Dermaptera. VI. Op.tiioftera. VII. Dictyoptera. 
Cohors II. Sipiionostomata. 
Mouth with an articulated rostrum, 
