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Show 732 MR. R. I. POCOCK ON ETHIOPIAN SPIDERS. [June 15, 4th 23; patella and tibia of 4th 8-5, of 1st 7*5; protarsus and tarsus of 4th 8. Loc. Kinyamholo, Lake Tanganyika. Two female examples. The males of the genus Acanthodon differ so strikingly from the females that unless taken during courtship it is almost impossible to compare them together. Erom its distribution A. meadll might be the o* of -4« lacustris, but would seem to be considerably too large ; for whereas the males of nearly all spiders are smaller than the females, the type of meadii exceeds that of lacustris, the carapace measuring 12 m m . in length as compared with 10'5. Allowing for differences owing to drying, the eye-formula seems to be practically the same in the three species. The male of thorellii may, however, be at once recognized from that of meadll by having the carapace smooth instead of coarsely granular, and by its much smaller size, the carapace measuring only about 4 m m . in length. The following two species are unknown to me :- Idlops compactus, Gerstaeeker in V on der Decken's Beisen in Ost- Africa, iii. ii. p. 484 (1873), based upon a female example from Dafeta (Kilimanjaro), is referable either to the genus Acanthodon or Hellgmomerus. Idiops aussereri, Simon, Bull. Soc. Zool. Erance, 1876, p. 223, from Landana on the Congo, is compared with A. meadii, Cambridge ; but said to differ from all the known species of Idiops in possessing six (instead of four) spinning-mammillae !! The following genera and species from Africa belonging to the Ctenizidae are unknown to m e : - Acontlus hartmannl, Karsch, SB. Ges. nat. Er. Berlin, 1879, p. 64. Loango. Aporoptychus africanus, Simon, Act. Soc. L. Bordeaux, xiii. p. 405 (1889). Landana, Congo. Ancylotrypa fossor,id. loc. cit. p. 406, Landana, Congo; and spinosa, p. 407, Port Elizabeth. Cyrtauchenlus zebra, Simon, Ann. Soc. Ent. France, lxi. p. 272 (1893). Zululand. Homostola vulpecula, id. loc. cit. p. 271. Zululand. Hermacha caudata, id. Act. Soc. L. Bordeaux, xiii. p. 408. Dela-goa Bay. Splroctenus personatus, id. loc. cit. p. 409. Delagoa Bay. The first of these, namely Acontlus hartmannl, is not satisfactorily diagnosed for classification. The second and third, namely Aporoptychus and Ancylotrypa, are referred by Simon to the section Aporopiychece of his subfamily Ctenizinae, characterized by having the maxillae nearly square as in Actlnopus and Eriodon, and two pairs of small marginal sigilla opposite the 2nd and 3rd pairs of legs, the terminal segment of the spinning-mammillae long and acuminate, while all or some of the feet have the claws biserially |