A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . ed by the expansion of the wings, and draws them towardsthe body as soon as the contraction of the muscles relaxes. This closing bandof the wings is assisted by a leverage system consisting of three little chitinousrods (c, d, e), which at its joining presses inwards on the body on one side, andon the hinder edge and head-joint of the wing on the other. We must, however, lay great stress on a f
A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . ed by the expansion of the wings, and draws them towardsthe body as soon as the contraction of the muscles relaxes. This closing bandof the wings is assisted by a leverage system consisting of three little chitinousrods (c, d, e), which at its joining presses inwards on the body on one side, andon the hinder edge and head-joint of the wing on the other. We must, however, lay great stress on a few more kinds of wing support. The wing-cases of beetles at their return from flight are joined together likethe shells of a mussel on the inside as well as to the wedge-shaped plate (Fig. 170, schi) betweentheir bases. There is evena kind of clasp at hand forthis purpose. The base ofthe wing, that is, bears apair of tooth-like projections(zffl), which fit into the cor-responding hollows of thelittle plate. The commissure arisingfrom the joining of the inneredges is characteristic. Usu-ally the wings on both sidesinterlock by means of agroove, as in stag-beetles,but sometimes even, as in fa schi. f , FIG. 170. — Mesothoracic skeleton of a stag beetle: sohi, alter tne manner SCiitellum, on each side of which is the articulation of the fore Of two COg-wheels, SO that ), consisting of two small stylilorm processes (», A) ofthe base of the wing ; za, tooth which fits into the cavity of 1 . i . ., hllO L/aOG \S1 ULLO YV lljg j JPLPj ItVUliU »» i_in_ l_l iJlO ill Lis Llic ^ tl V 1U y VI we have here also an imita- the wing-lock (g>-); /, edge of the right wing, passing intothetion Of the two most prev- corresponding groove (fit) of the left; Di, diaphragm for the attachment of the tergal muscle of the uietasternum ; Di\ (not alent methods which the explained by author); Aer, acetabulum of the coxa (////); ,sV>,cabinet-maker uses in join- chitinous process for the attachmen
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
