Entomology : with special reference to its biological and economic aspects . Fig. 127. Section through tongue of wasp, Vespa vulgaris, c, cuticula; g, gland cell; h,hypodermis; n, nerve; ob, gustatory bristle; ph, protecting hair; sc, sensory cell; tb,tactile bristle.—After Will. pectingly a mixture of honey and phosphorus until some ofthem were killed by it. Under the same circumstances, manwould be able to detect the phosphorusbut not the glycerine. Location of Gustatory Organs.—Aswould be expected, the end-organs oftaste are situated near the mouth, com-monly on the hypopharynx (Fig. 126),e
Entomology : with special reference to its biological and economic aspects . Fig. 127. Section through tongue of wasp, Vespa vulgaris, c, cuticula; g, gland cell; h,hypodermis; n, nerve; ob, gustatory bristle; ph, protecting hair; sc, sensory cell; tb,tactile bristle.—After Will. pectingly a mixture of honey and phosphorus until some ofthem were killed by it. Under the same circumstances, manwould be able to detect the phosphorusbut not the glycerine. Location of Gustatory Organs.—Aswould be expected, the end-organs oftaste are situated near the mouth, com-monly on the hypopharynx (Fig. 126),epipharynx and maxillary palpi. On thetongue of the honey bee the taste organsappear externally as short setae () and on the maxillae of a wasp aspits, each with a cone, or peg, projectingfrom its base (Figs. 128, 129). Similartaste pits and pegs have •been found byPackard on the epipharynx in most of the. Tongue of honey bee,Apis mellifera. p, pro-tecting bristles; s, ter-minal spoon; t, tastesetae.—After Will. mandibulate orders of insects. <yi^ Histology.—The end-organs of taste arise from snpqfSfr ^v^hypodermis cells, as minute setae or, more commonJ^,^egt^^ 1^ 98 ENTOMOLOGY Fig. 128 ::. tc ?•th each seated in a pit, or cup, and connected with a nerve fiber(Figs. 129, 130). In some cases, however, it is difficult to decide whether a given organis gustatory or olfactory, owingto the similarity between thesetwo kinds of structures. Inacjuatic insects, indeed, thesenses of taste and smell are notdifferentiated, these forms hav-ing with other of the loweranimals simply a chemical sense. Smell.—In most insects thesense of smell is highly efficientand in many species it is incon-ceivably acute. Hosts of in-sects depend chiefly on theirolfactory powers to find food,for example many beetles, theflesh flies and the flower-visit-ing moths; or else to discoverthe opposite se
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
