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 . FIG. 211. — Section of internment ofDatana minixtra: e, cuticnla; fii/ji, hypo-dermis; p, outer pigmented nodulated The integument of many insects contains finecanals passing through the chitinous layers and open-ing externally in minute pores. Certain of the pore-canals communicate with hollow setae which sitdirectly over the pores ; other pores form the externalopenings of dermal glan
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 . FIG. 211. — Section of internment ofDatana minixtra: e, cuticnla; fii/ji, hypo-dermis; p, outer pigmented nodulated The integument of many insects contains finecanals passing through the chitinous layers and open-ing externally in minute pores. Certain of the pore-canals communicate with hollow setae which sitdirectly over the pores ; other pores form the externalopenings of dermal glands, but in many cases theyare empty or only filled with air, and do not haveany hairs connected with them. Each of these porescommunicates with a hair-forming hypodermal cell,called by Graber a tricliogen. Setae (hairs and bristles). --The setae of insectsare, as in worms, processes of the cuticle originatingFm. 212.— irairs from certain of the hypodermal cells. They arise Datana: /, forma- ... two haircdi; c,cuti- either from a ring-like pit, or from a minute tubercle, cula; ]>, pigmented . e layer; hy, hypoder- and are usually situated at the outlet of a pore-canal,which connects with an underlying cell of the hypo-dermis (Fig. 212). They are, then, bristle or hair-like processesarising from the hypodermis. Wh
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
