Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . ndages called balancers : othermodifications of, or appendages to, the wings have been called alulaaand patagia. The Orders of Insects being, as before remarked, founded uponthe modifications of the wings, the chief of these are best exemplifiedby recapitulating the ordinal characters. Those Insects in which thefirst pair of wings are hard, infiexible, and serve as sheaths (elytra),and the second alone are used for flight, and are folded transverselywhen at rest, consti
Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . ndages called balancers : othermodifications of, or appendages to, the wings have been called alulaaand patagia. The Orders of Insects being, as before remarked, founded uponthe modifications of the wings, the chief of these are best exemplifiedby recapitulating the ordinal characters. Those Insects in which thefirst pair of wings are hard, infiexible, and serve as sheaths (elytra),and the second alone are used for flight, and are folded transverselywhen at rest, constitute the order Coleoptera : these insects undergocomplete metamorphosis, and are subdivided according to the numberof joints of the tarsi. Beetles and most burrowing Insects belong tothis order. Those Insects in which the anterior pair of wings are convertedinto elytra, of less density than in the Coleoptera, and in which theposterior wings are folded longitudinally when at rest, constitute theorder Orthoptera: they are said to undergo a semi-metamorphosis,the chief chaiige being the acquisition of wings. This order in-. INSECTA. 353 eludes the most voracious and destructive insects, as the Locust,Cockroach, &c. Those insects which have both pairs of wings membranous, trans-parent, strengthened by numerous nervures, and finely reticulated,form the order Neuroptera^ which includes the highest organisedinsects, as the predatory dragon-flies. The insects which have four membranous wings simply veined, andcrossing each other horizontally when at rest, form the order Hyme-iioptera : they undergo a complete metamorphosis, and include themost useful of insects, e. g.^ the bee. The insects with four wings, more or less clothed with minutescales, are called Lepidoptera: they 1^3 undergo complete metamorphosis,and include the most beautiful spe-cies of the class, as the butterflies :in one family of this order the wings are divided lengthwise intoanum- ^^^9iWi§^^^ ber of feathered piece
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1850
