. Annals of the Entomological Society of America. Entomology. 1908] Female Reproductive Organs of Cimhex 89 13 and 18, d). Near the opening of the duct are two bundles of transverse muscles, which leave the dorsal wall of the duct and attach to the basal margin of the sheaths of the saws (Figs. 13 and 17, tm). Dorsally, the colleterial duct is in continuation with two lobes (Fig. 13, dl) which, in turn, are in continuation w4th the membrane that lines the inner surface of the saws. Ventrally, the wall of the duct terminates in a large fold (Figs. 13 and 18, vf). The duct of the colleterial sac
. Annals of the Entomological Society of America. Entomology. 1908] Female Reproductive Organs of Cimhex 89 13 and 18, d). Near the opening of the duct are two bundles of transverse muscles, which leave the dorsal wall of the duct and attach to the basal margin of the sheaths of the saws (Figs. 13 and 17, tm). Dorsally, the colleterial duct is in continuation with two lobes (Fig. 13, dl) which, in turn, are in continuation w4th the membrane that lines the inner surface of the saws. Ventrally, the wall of the duct terminates in a large fold (Figs. 13 and 18, vf). The duct of the colleterial sac thus opens out between the tw^o dorsal lobes and the large ventral fold (Fig. 13, c/). When the spermatheca and colleterial sac are carefully pulled away from each other, there is revealed a triangular chitinous plate, which rests upon the dorsal wall of the oviductus communis. To this plate several bands of muscle attach (Fig. 13, tp). HISTOLOGICAL STRUCTURE OF THE FEMALE REPRODUCTIVE ORGANS. Ovaries: Each ovary is made up of a variable number of ovarian tubules or ovarioles, there being usually between twenty and thirty. In six specimens dissected, the number of ovarian tubes in the entire ovary was neither constant nor equal in either ovary, as is shown by the following figures: Ovarioles in Right Total in Both. 28 21 27 25 25 30 Average, 26 51 44 52 52 49 58 51 When the lowest egg in each tubule is ripe or nearly so, it is elongated more or less ovoid in shape with the distinction between dorsal and ventral surfaces indicated by a difference in curvature. After the lowest egg in each ovariole has passed out of the egg- tube, each tubule appears to be supported upon a stalk which opens into the oviduct. Alternating with each egg-chamber is a nutritive or yolk-compartment, the latter being distinguishable from the former with the naked eye only at the basal end of the ovarian tubule by its smaller size. The nutritive chamber, which is anterior to the basal egg, is us
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