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 . latory duct. It is usually enclosedbetween two lateral plates, the homologues per-haps of the inner pair of sheaths of the ovi-positor. In the Coleoptera, as in Carabidse andMelolonthidcie, the penis is a long chitinous tube, retractile within the abdomen on the under surface as far as theanterior segments. (Newport.) In the Hymenoptera, of whichthat of the saw-flies is a type, Newport states t
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 . latory duct. It is usually enclosedbetween two lateral plates, the homologues per-haps of the inner pair of sheaths of the ovi-positor. In the Coleoptera, as in Carabidse andMelolonthidcie, the penis is a long chitinous tube, retractile within the abdomen on the under surface as far as theanterior segments. (Newport.) In the Hymenoptera, of whichthat of the saw-flies is a type, Newport states that it consists ofa short valvular projectile organ, covered externally by two pointedhorny plates (?) clothed with soft hairs. Above these are two otherirregular double-jointed plates (Fig. 202, I) surrounded at their baseby a chitinous ring (); they are edged with prehensile hookedspines (i). Between these in the middle line are two elongatedmuscular parts (ni) which enclose the penis (li), and which, likethose in beetles, perhaps aid in dilating the vulva of the female. An examination of Figs. 2<)--5-207 will aid in understanding thevarious modifications in beetles, etc., of this Fio. 202. — Male organsof generation of Atlialiu.—After Newport. THE MALE GENITAL ARMATURE 181 A general study of the anatomy and homologies of the male genitalarmature, from a developmental point of view, together with a com-parison of them with the corresponding female organs, is stillneeded. Velum the locusts (Acrydiidae) the penis is concealedby a convex plate, flap, or hood, free anteriorly and attached pos-teriorly and on the sides to the ridge forming the upper edge of the tenth sternite. When about tounite sexually, the tip of the abdo-
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
