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200 of the plans now zealously advocated by a few naturalists in this country promise to answer this end, forms no part of our present purpose to enquire. In common with all others hitherto proposed, they recognise certain primary divisions of the class, many of them corresponding, or nearly so, to those established by Linnæus; these divisions, therefore, as forming the most generally approved basis of arrangement, and of fundamental importance in every point of view, we design to explain at some length, and illustrate by a variety of examples. They are termed Orders, and are the first subdivision of the class. The following is a tabular view of them, with concise distinctive characters.

Insects

with wings Mouth

organised for gnawing, wings four of unequal transversely, consistency, the under longitudinally, pair folded reticulated, of equal naked, consistency, veined, hairy, two, organised for sucking, wings four not clothed with scales, clothed with scales, two,

without wings. undergoing metamorphosis, mandibulated, no metamorphosis, suctorial, Each order is generally subdivided into comprehensive Sections according to the number of joints in the tarsi, structure of the antennæ, conformation of