402 Mr. W. F. Kirbj on the ments (14—17). Male generative apertures paired, and situ-ated upon 18th segment of body, which is always behind the elitellum ; genital papillte occasionally developed in neigh-bouring segments. Female generative aperture single, and within the elitellum upon the 14th segment. Two pairs of testes, more or less solid and compact^ in segments 11 and 12 ; terminal portion of vas deferens on either side connected with the duct of a large prostate gland. Copulatory pouches varying in number from two to four pairs, and provided each with a variously shaped supplementary pouch or pouches. Intestine with a cascum on either side in 20th segment*. Megascolex, Templeton. Megascolex, Templeton, P. Z. S. 1845, p. 89. Pleurochceta, F. E. B., Trans. Roy. Soc. Edinb. vol. xxx. pt. ii. Sette arranged in nearly a continuous row round each seg-ment, only failing for a short space in the dorsal and ventral median lines ; elitellum occupying segments 13-20, but not developed upon the area which separates the male genital aper-tures and papillaE! of one side from those of the other. Male genital apertures paired and situated upon 18th segment of body, which is within the area over which the elitellum extends ; genital papillee two pairs, developed upon boundary-line between 17th-18th and 18th-19th segments respectively. Female generative pore single or double, upon 14th segment. A single pair of testes, branched and racemose, in 12th seg-ment ; a large prostate gland on either side in 18th segment. Copulatory pouches simple and unprovided with any supple-mentary pouches J two pairs situated in segments 8 and 9. Intestine with no caecum, but with a series of large compact glands arranged in fifteen or sixteen pairs, commencing at about segment 106. XLVII. — On the Hymenoptera collected during the recent Expedition of H.M.8. ^Challenger.'' By W. F. Kirby, Assistant in Zoological Department, British Museum. The series of Hymenoptera collected during the voyage of H.M.S. ' Challenger ' is interesting not only on account of several apparently new species having been obtained, but because * In two species, P. Sieboldi and P. musicus, Horst (' Notes Leyden Museum,' &c. pp. 192 & 194) describes sis of these cieca on each side; but in the latter species, at least, they do not seem to be at all regular in their presence.