Structure and classification of insects . CHALCTS-CLAVTPES. The legs of insects are constriictecl on the oppositeplan from that of vertebrates. Instead of consisting, asthe arms or legs of the quadrupeds or the human system,of a central bone or haid substance for a lever, with themuscles as cords, and their attendant organs wrappedaround it, each joint is a tube, and serves as the bone orskeleton of the limb, and includes within it the movingmuscles, nerves and other special organs.. HIND LEG OF BEES. a, coxa; &, trochanter ; c, femur ; d, tibia ; g, tarsus. The legs of insects generally consi

Structure and classification of insects . CHALCTS-CLAVTPES. The legs of insects are constriictecl on the oppositeplan from that of vertebrates. Instead of consisting, asthe arms or legs of the quadrupeds or the human system,of a central bone or haid substance for a lever, with themuscles as cords, and their attendant organs wrappedaround it, each joint is a tube, and serves as the bone orskeleton of the limb, and includes within it the movingmuscles, nerves and other special organs.. HIND LEG OF BEES. a, coxa; &, trochanter ; c, femur ; d, tibia ; g, tarsus. The legs of insects generally consi Stock Photo
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Structure and classification of insects . CHALCTS-CLAVTPES. The legs of insects are constriictecl on the oppositeplan from that of vertebrates. Instead of consisting, asthe arms or legs of the quadrupeds or the human system, of a central bone or haid substance for a lever, with themuscles as cords, and their attendant organs wrappedaround it, each joint is a tube, and serves as the bone orskeleton of the limb, and includes within it the movingmuscles, nerves and other special organs.. HIND LEG OF BEES. a, coxa; &, trochanter ; c, femur ; d, tibia ; g, tarsus. The legs of insects generally consist of five pieces; the coxa or hip—the trochanter—the femur, or thigh—the tibia, or shank—the tarsus, or foot. These parts are not, however, the same in structure with those that bear THE THOKAX OR TEUISTI. 51 the same names among the vertebrates, but merely re-semble them in position and functions ; they may hencebe said to be analogous with them, but not homologous.Of these parts the tarsus alone is composed of severalpieces or joints, which vary in number. The mostuniversal number of joints is five, and such insects aretermed pentamerous. In some the number of jointsvaries in the different pairs of legs, and such are termedheteromerous; others again have four joints—tetramer-ous ; three joints, trimerous ; two joints; dimerous; onejoint, monomerous; or more than five joints, polymerous.

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