. Elementary text-book of zoology. Zoology. 526 INSECTA. while on the mesonotum there is a median triangular plate (the scutellum}, and on the inetanotum there is not rarely a similar but smaller shield (the postscutellum). The manner in which the three regions of the thorax are connected with one another varies in the different orders. In the Goleoptera, Neuroptzra, Orthoptera and in many ffhi/nchota, the pro-thorax is freely movable, while in all other cases it is a relatively small ring and is fused with the following segments. The three pairs of legs are articulated in excavations of the c
. Elementary text-book of zoology. Zoology. 526 INSECTA. while on the mesonotum there is a median triangular plate (the scutellum}, and on the inetanotum there is not rarely a similar but smaller shield (the postscutellum). The manner in which the three regions of the thorax are connected with one another varies in the different orders. In the Goleoptera, Neuroptzra, Orthoptera and in many ffhi/nchota, the pro-thorax is freely movable, while in all other cases it is a relatively small ring and is fused with the following segments. The three pairs of legs are articulated in excavations of the chitinous integument of the ventral surface between the sterna and pleura. The number and size of the joints of the legs seem. FIG. 435.— Different form of legs (regne animal), a, Mantis with predatory leg ; b, leg of Caralitty used in running; c, of Acridium used in springing; if, of Grryllotalpa used in digging; e, swimming leg of more constant in the Insecta than in any other group of the Arth- ropoda, so that it is possible to distinguish five regions (fig. 435). The basal joint (coxa), which is either spherical or cylindrical, is articulated to the thorax and permits of free movement of the limb. The coxa is followed by a second very short ring, constituting the trochantet; which is sometimes divided into two parts or in other cases is fused with the next joint. The third joint, which is con- spicuous on account of its size and strength, is the long femur. The next joint is the likewise long but slender tibia, which is armed at. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
