. The Cambridge natural history. Zoology. ACULEATA withdrawn into the body in a direct manner so as to be entirely internal, whereas in the Parasitica it is not withdrawn in this manner, but remains truly an external organ, though in numerous cases concealed by a process of torsion of the terminal seg- ments. If this were done it might be found possible to divide the great group thus formed into t\vo divisions characterised by the fact that the ovipositor in one retains its function, the egg FIG. 2.—Diagram of upper sur- face of Priocnemis affi-iiis 9, Pompilidae. o, ocelli ; 7J1, pronotuni ;
. The Cambridge natural history. Zoology. ACULEATA withdrawn into the body in a direct manner so as to be entirely internal, whereas in the Parasitica it is not withdrawn in this manner, but remains truly an external organ, though in numerous cases concealed by a process of torsion of the terminal seg- ments. If this were done it might be found possible to divide the great group thus formed into t\vo divisions characterised by the fact that the ovipositor in one retains its function, the egg FIG. 2.—Diagram of upper sur- face of Priocnemis affi-iiis 9, Pompilidae. o, ocelli ; 7J1, pronotuni ; Rz, mesonotum ; B3, scutellum of mesonotnm ; B4, post-scutelluni or middle part of metanotum ; B5, propo- deuni or median segment (see vol. v. p. 491) ; If', combing hairs, pecten, of front loot: C1, first segment of abdomen, here not forming a pedicel or stalk : Z)1,coxa; JL>'2, trochauter; Lt3, femur ; />6, calcaria or spurs of bind leg : 1 to 15, iierv- ures of wings, viz. 1, costal ; 2, post-costal ; 3, median ; 4, posterior ; 5, stigma ; 6, marginal ; 7, upper basal ; 8, lower basal ; 9, 9, cubital ; 10, the three sub- marginal ; 11, first recurrent ; 12, second recurrent; }?,, anterior of hind, wing; 1J, median ; 15, posterior : I to XI, the cells, viz. I. upper basal ; II, lower basal ; III, marginal : IV, V. VI, first, second and third sub-mar- ginal ; VII, first discoidal ; VIII, third discoidal ; IX, second discoidal ; X, first apical ; XI, second apical. passing through it (Proctotrypidae and Tubulifera), while in the other the organ in question serves as a weapon of offence and defence, and does not act as a true ovipositor, the egg escaping at its base. It would, however, be premature to adopt so revolu- tionary a course until the comparative anatomy of the organs concerned shall have received a much greater share of We have dealt with the external anatomy of Hymenoptera in 1 For new views on this subject see note on p. Please note that th
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Keywords: ., bookauthorha, bookcentury1800, bookdecade1890, booksubjectzoology
