Entomology : with special reference to its biological and economic aspects . ia and M. has found that thescales arise from glandularcells, which doubtless secretea fluid that emanates fromthe scale as an odorous va-por, the evaporation of thefluid being facilitated by thespreading or branching formof the androconium. Similarscales occur also on the wings of various moths and someTrichoptera (Mysfacides). Glands.—A great many glands of various form and func-tion have been found in insects. Most of these, being formedfrom the hvpodermis, may logically be considered here, ex-cepting some
Entomology : with special reference to its biological and economic aspects . ia and M. has found that thescales arise from glandularcells, which doubtless secretea fluid that emanates fromthe scale as an odorous va-por, the evaporation of thefluid being facilitated by thespreading or branching formof the androconium. Similarscales occur also on the wings of various moths and someTrichoptera (Mysfacides). Glands.—A great many glands of various form and func-tion have been found in insects. Most of these, being formedfrom the hvpodermis, may logically be considered here, ex-cepting some which are intimately concerned with digestionor reproduction. Glandular Hairs and Spines.—The presence of adhesivehairs on the empodium of the foot of a fly enables the insectto walk on a smooth surface and to walk upside down; thesetcnent hairs emit a transparent sticky fluid through minutepore canals in their apices. The tenent hairs of Hylobius(Fig. 98) are each supplied with a flask-shaped unicellulargland, the glutinous secretion of which issues from the bulbous. Section across tarsus of a beetle,Hylobius, to show bulbous glandularhairs.—After Simmermacher. ANATOMY AND PHYSIOLOGY 8i Fig. 99.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
