. Ants; their structure, development and behavior. ell and a nerve cell. It is possible to show that this type ofstructure keeps recurring in the various sense-organs of even sughhighly-specialized insects as the ants. Tactile (Trichodeal) Sensillae.—As stated in a previous chapter,ants are usually covered with hairs, which are coarse and long on thebody and shorter and denser on the legs and especially on the all of these hairs are movably articulated to the general chitinousintegument and are provided with fine nerve terminations, they areuniversally regarded as tactile sensilla,
. Ants; their structure, development and behavior. ell and a nerve cell. It is possible to show that this type ofstructure keeps recurring in the various sense-organs of even sughhighly-specialized insects as the ants. Tactile (Trichodeal) Sensillae.—As stated in a previous chapter,ants are usually covered with hairs, which are coarse and long on thebody and shorter and denser on the legs and especially on the all of these hairs are movably articulated to the general chitinousintegument and are provided with fine nerve terminations, they areuniversally regarded as tactile sensilla, although they also aid in theremoval of the larval or pupal skin during ecdysis, for they are atfirst bent at their bases and applied to the chitinous layer to whichthey belong, but later, in becoming erect, loosen and push the overlying 6o ANTS. cxuvia away from the surface of the body. In section each hair isto be a hollow chitinous tube, closed at its apex and open at itsr-e, which is bulbously swollen and fits into a ring-shaped thickening. E n G FIG. 31. Trichodeal and campaniform sensillae of ants. (Janet.) A. Trichodealsensillse from proximal border of fore coxa of female Lasiits niger, X 1,000 ; B. singlesensilla from the group represented in A, X 2,000; C, longitudinal section throughtip of middle coxa, trochanter and base of femur of Myrmica nibra worker. X 100;D, cross-section of tip of hind tibia of M. ntbra. X 200 : E, F and G, sections of cam-paniformsensillae from tip of mandibles of M. ritbra; H, campaniform sensilla? neararticulation of wing of female Camponotits herculeanus, X 500 ; /, chitinous hair ; integument ; h, hypodermis : n, nerve-termination ; u. bell, or umbrella, inthe center of which the nerve terminates; x, groups of campaniform sense-organs;d, fossa or pit in the chitinous integument; p, pore in same. of the chitinous integument (Fig. 31, A, B, Fig. 32, b). This tube issecreted by one or more large hypodermal cells, and a delicate
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectants, bookyear1910
