The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . en to be observed. Theselegs, which are, in fact, the chief organs whereby the insectsare enabled to carry on their varied economy and habits, arenecessarily very varied in their form, and in the appendageswdth which they are furnished. The abdomen, which is alsoof a very varied form, is attached to the posterior part of thethorax, either by its entire width, in which case it is said tobe sessile, or by means of a slender peduncle,
The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . en to be observed. Theselegs, which are, in fact, the chief organs whereby the insectsare enabled to carry on their varied economy and habits, arenecessarily very varied in their form, and in the appendageswdth which they are furnished. The abdomen, which is alsoof a very varied form, is attached to the posterior part of thethorax, either by its entire width, in which case it is said tobe sessile, or by means of a slender peduncle, or foot-stalk,which in some groups is also as long as the abdomen the extremity of this abdomen, on its lower surface, isattached the ovipositor, saw, or sting above mentioned,each of which, although varied in form, so as to suit its HYMENOPTERA : STRUCTURE. 375 intended uses, is but a modification of the same the centre of the under-side of the abdomen, near itsextremity, arise two plates, each consisting of two joints,sometimes valvular, and together forming a scabbard, some-times more slender, and resembling palpi, and sometimes. Dees Sting. very long; between these plates (fig. 1 and 2, as they existin the bee, under the form of two flattened plates, with apair of ^mall terminal lobes) arise two other pieces, whichare very slender, serrated at the tip in the bees (fig. 3 and 5),but much broader in the saw-flies, and transversely striated,forming the saws with which these insects are provided:moreover, these two pieces are received, in the bees, into acanal (fig. 2 and 4), but in the saw-flies this gutter is broad.
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Keywords: ., bookau, bookcentury1800, booksubjectcrustacea, booksubjectinsects
