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 . sc--- Fio. 216. — Section of a subdorsal tuberclefrom a larva in stage I : fte, the setigenouscells, one for each seta; pglc, nuclei by whichthe poison is secreted ; «, seta; p, poison inmiddle of a broken spine ; out, cuticle ; s</.tub, spinulated surface of the Fio. 217. — Armature of last four segments of Callosamia promelhed : a, a dorsal seta ; b, oneshowing the pois
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 . sc--- Fio. 216. — Section of a subdorsal tuberclefrom a larva in stage I : fte, the setigenouscells, one for each seta; pglc, nuclei by whichthe poison is secreted ; «, seta; p, poison inmiddle of a broken spine ; out, cuticle ; s</.tub, spinulated surface of the Fio. 217. — Armature of last four segments of Callosamia promelhed : a, a dorsal seta ; b, oneshowing the poison (p) within. MODE OF GROWTH OF THE HAIRS 193 importance, it is evidently of great biological importance, the welfare or eventhe life of the insect depending upon it; and it varies in each species of insect,especially in Diptera, where the position of even a single seta characterizes thespecies. The mode of development of the hairs was first described bySemper. In the pectination of the antenna of Saturnia carpini heobserved that the hairs arise, like the scales of the wings, from large
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
