Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . ,usually so trenchantlymarked in the higherHymenoptera, are here Fis- 144-less distinct, since the abdomen is sessile, its basal ring being / o fj broad and applied closely to the thorax, while the succeedingrings are very equal in size. The head is broad and the thoraxwide, closely resembling that of the Lepidoptera. The wings(Fig. 144, fore-wing) are larger in proportion to the restof the body than usual; they are more net-veined, the cellsbein
Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . ,usually so trenchantlymarked in the higherHymenoptera, are here Fis- 144-less distinct, since the abdomen is sessile, its basal ring being / o fj broad and applied closely to the thorax, while the succeedingrings are very equal in size. The head is broad and the thoraxwide, closely resembling that of the Lepidoptera. The wings(Fig. 144, fore-wing) are larger in proportion to the restof the body than usual; they are more net-veined, the cellsbeing more numerous and extending to the outer margin.* *In treating of this family we avail ourselves largely of the important work onthe American species, publishing at the time of writing, by Mr. E. Norton, in theTransactions of the American Entomological Society, vols. 1, 2. WQ therefore. 214 HYMENOPTERA. All these characters show that the saw-fly is, n degradedHymenopter. The antennoe are not elbowed ; are rather short and simple,clavate. but in rare instances fissured or feathered. The ab-domen consists, usual]}, of eight external segments, the twolast being aborted on the under side, owing to the great develop-ment of the ovipositor. The ovipositor or asaw (compareFig. 24) consists of two lamella?, the lower edge of which istoothed and fits in a groove in the under side of the upper one,which is toothed above, both protected by the usual sheath-likestylets. On pressing, says Lacaze-Duthiers, the end of theabdomen, we see the saw depressed, leave the direction ofthe axis of the body, and become perpendicular. By thismovement the saw, which both cuts and pierces, makes a gashin the soft part of the leaf where it deposits its eggs. The eggs are laid more commonly near the ribs of the leaf,in a series of slits, each slit containing but a single species, 011 the
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishe, booksubjectinsects
