Signs of copulation in insects.—Leydig has collected, partly from his own observations and partly from those of others, a number of cases in which female insects bear traces of having had sexual union, in the form of tags or plates attached to the body, and apparently formed from material secreted by the male. Such probably is the “pouch” on the abdomen of Parnassius apollo, and a somewhat similar structure in Fulgora laternaria, and such is the plate which is found on the hinder part of the abdomen of Dyticus latissimus and D. marginalis. Leydig compares these structures with the white plate in Astacus fluviatilis, and with the little white lid on the spider Argenna, and finds analogues among vertebrates. (Arbeit. Zool. Zoot. Inst. Wurzburg, x, 1891, pp. 37–55, 2 Figs.)
LITERATURE ON THE ORGANS OF REPRODUCTION
a. General
Hunter, J. Observations of bees. (Phil. Trans. Roy. Soc. London, 1792, lxxxii, pp. 128–195.)
Hegetschweiler, J. J. Dissertatio inauguralis zootomica de insectorum genitalibus. Turici, 1820, pp. 28, 1 Pl.
Audouin, V. Recherches anatomiques sur la femelle du Drile jaunatre et sur le male de cette espèce. (Ann. Sc. nat., ii, 1824, pp. 443–462, 1 Pl.)
Müller, Johannes. Ueber die Entwickelung der Eier im Eierstock bei den Gespenstheuschrecken. (Nova Acta Acad. Leop.-Carol., xii, 1825, pp. 555–672, 6 Taf.)
Dufour, L. Recherches anatomiques sur les Carabiques et sur plusieurs autres insectes coléoptères. Organes de la génération (Ann. Sc. nat., vi, 1825, pp. 150–206, 6 Pls.; pp. 427–468, 4 Pls.).
—— Recherches anatomiques sur l’Hippobosque des cheveaux. (Ibid., 1825, vi, pp. 299–322, 1 Pl.)
—— Recherches anatomiques sur les Labidoures. Appareil de la génération. (Ibid., 1828, xiii, pp. 354–359, 2 Pls.)