Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . FIG. a3.—I, fore tibia of a European grasshopper (Meconema), containing : Ty, tympanum or outer membrane: 7V1, 7Y2, trachea. II, diagram-matic cross-section through the tibia and e;ir of the same: Ty, tympanum;Ct, cuticula; CM, hypodermis; A. the auditors organ connecting with thetympanum; B, supra-tympanal auditory organ ; (*Z, the ganglion-cell belong-ing to them; Hst, the auditory rod connecting with the ganglion-cells —Afterdraber, from Judeich and Nltsche. 30 ENTOMOLOGY. arises from the th
Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . FIG. a3.—I, fore tibia of a European grasshopper (Meconema), containing : Ty, tympanum or outer membrane: 7V1, 7Y2, trachea. II, diagram-matic cross-section through the tibia and e;ir of the same: Ty, tympanum;Ct, cuticula; CM, hypodermis; A. the auditors organ connecting with thetympanum; B, supra-tympanal auditory organ ; (*Z, the ganglion-cell belong-ing to them; Hst, the auditory rod connecting with the ganglion-cells —Afterdraber, from Judeich and Nltsche. 30 ENTOMOLOGY. arises from the third thoracic ganglion, forms a ganglion(go) upon the tympanum, and terminates in the immediateneighborhood of the labyrinth by a collection of cuneiform,staff-like bodies, with very finely-pointed extremities (primi-tive nerve-fibres?), which are surrounded by loosely aggre-. FIG. 24.—Musical apparatus of cricket, a. a, tracheal tube; b. rasp or ridgebearing vibratory flanges; d, resonant surface, with ridges. gated ganglionic globules (Siebolds Anatomy of the In-vertebrates). In the green grasshoppers, katydids, andtheir allies, the ears are situated on the fore legs (tibia?),where these organs can be found after a careful search (). Having ears to hear, locusts, grasshoppers, katydids, a,ndcrickets are also very musical. One may sometimes see thered-legged locust standing on the ground and rubbing oneleg against the folded wing, and a shrill chirruping noisemay be heard. The noise ismade by a row of dull spineson the inside of the femur,forming a rude file whichrasps the wing. Certaingrasshoppers, as the katy-did and the crickets (, 25), have on the underside of the uppermost of the fore wings a sort of file which FIG. 25.—Enlarged view of the vibratory flanges seen at b, Fig. 24.—This and rubs over a resonant surface, Fig. 19 after N.
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
