A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . Fio. 225. — Portion of a longitudinal sectionthrough a pupal wing about. eight days beforeemergence: xy formative scale-cell; upper «, ascale. SPINULES AND HAIR-SCALES 197 and not into a tube, as Landois supposed. Spuler describes a sortof double sac structure or follicle (Schuppenbalg) which receives thehollow pedicel of the scale. This was originally (1860) observed byF. J. Carl Mayer, but mo
A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . Fio. 225. — Portion of a longitudinal sectionthrough a pupal wing about. eight days beforeemergence: xy formative scale-cell; upper «, ascale. SPINULES AND HAIR-SCALES 197 and not into a tube, as Landois supposed. Spuler describes a sortof double sac structure or follicle (Schuppenbalg) which receives thehollow pedicel of the scale. This was originally (1860) observed byF. J. Carl Mayer, but more fully examined by Spuler (Fig. 228)though not detected by A. G. Mayer. Spinules, hair-scales, hair-fields, and androconia. — Besides thescales, tine spinules occur on the thickened veins of the wings of. eual FIG. 226. —Portion of a cross-section through the pupal wing of D<niaia f/lfxippiis, about sixdays before emergence: $g, scale; , wing-membrane ; , formative cell of the scale;, ground-membrane ; , hypodermal fibres of pupal wings. A, portion of a longi-tudinal section through the pupal wing, eight or nine days before emergence; pro, processes ofyoung hypodermis scales. — This and Figs. 228-225 after Mayer. the Blattidae, where they resemble fir-cones; also in the Perlidae, inthe Trichoptera, and in the more generalized Lepidoptera (Microp-terygidae and Hepialidae), occur, as indicated by Spuler, delicatechitinous hollow spinules scarcely one-tenth as long as, and morenumerous than, the scales, which sometimes form what he calls Haftfelds, or holding areas. These spinules have also beennoticed by Kellogg, and by myself in Micropteryx; Kellogg, andalso Spuler, have observed them in certain Trichoptera (Hydro- 198 TEXT-BOOK OF ENTOMOLOGY psyche). Th
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
