Entomology : with special reference to its biological and economic aspects . o folds meet and unite to form twomembranes (Fig. 191), namely, an inner one. or aiimioii, andan outer one, or serosa. Fig. 192. SS^\ ,v>#fSi?^. %?? -Si 5; as. 11 II if ^ ^^ S5 .V: ;;,;:^.,v;,,\ ;/-:.^- ??^-^ if q^Rf Mi ^V>. i^ # i ^ »^1S fj^ VS WW v-*- 11 * - t^^ is { K-^*-^:^ sfr I ^? %^. E ; • £^-15^ V- jij w;; i-^ •^ * =S ^ ki ~K- 11 f oj- B fci ^ Germ band of a beetle, .l/c/(75oiu«, in three successive stages. A, unsegmented;B, with oral segments demarkated; C, with three oral, three thoracic and two ab-dom
Entomology : with special reference to its biological and economic aspects . o folds meet and unite to form twomembranes (Fig. 191), namely, an inner one. or aiimioii, andan outer one, or serosa. Fig. 192. SS^\ ,v>#fSi?^. %?? -Si 5; as. 11 II if ^ ^^ S5 .V: ;;,;:^.,v;,,\ ;/-:.^- ??^-^ if q^Rf Mi ^V>. i^ # i ^ »^1S fj^ VS WW v-*- 11 * - t^^ is { K-^*-^:^ sfr I ^? %^. E ; • £^-15^ V- jij w;; i-^ •^ * =S ^ ki ~K- 11 f oj- B fci ^ Germ band of a beetle, .l/c/(75oiu«, in three successive stages. A, unsegmented;B, with oral segments demarkated; C, with three oral, three thoracic and two ab-dominal segments.—After Graber. Segmentation and Appendages.—On the germ band,which represents the ventral part of the future insect, the bodyseements are marked off bv transverse grooves (, 194) ; this segmentationbeginning usually at the an-terior end of the germ bandand progressing , an anterior in- (Fig- 193)the stoinoihcinii,from which the mouth,pharynx, CESophagus and other partarise; a similar Fig. 193. folding occursforming. )iagrammatic sagittal section ofhymenopterous egg to show stomodDeal(s) and proctodseal (p) invaginationsof the germ band (g).—After Graber. f the fore gut are to)ut posterior invagination, or procfodccitm ISO ENTOMOLOGY Fig. 194.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
