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 . rgence: $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, i
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 . rgence: $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). These also occur on the veins, and detached ones nearlarge one-jointed hairs, or hair-scales, said by Kellogg to be stri-. FIG. 227. — View looking down upon theupper ( exposed) surface of one of the largescales situated on the veins of Danais plex-ippus, about four days before emergence:elm, chitinous pillars found in scales. A, asmaller scale, a, a, sections of the scales. B,leucocyte found in the larger scale. — AfterMayer.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
