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Show 844 MR. R. I. POCOCK ON SCORPIONS, PEDIPALPS, [Nov. 14, Genus HYSTEROCRATES Simon. HYSTEROCRATES GIGAS POC. Hysterocrates gigas Poc loc. cit. p. 762. Loc. Cameroons (J. M. C. Johnston) ; Oil Biver (H. IT. Johnston). HYSTEROCRATES LATICEPS Poc. Hysterocrates laticeps Poc. loc cit. p. 765, pl. xii. figs. 4-4 b. Loc. Old Calabar (Miss Kingsley). HYSTEROCRATES CRASSIPES POC. Hysterocrates crassipes, Poc. loc. cit. p. 764, pl. xii. fig. 4 c. Loc. Cameroons (H. H. Johnston). HYSTEROCRATES HERCULES, sp. n. 2 . Colour. Integument black, covered with a thick coating of dark olive-brown hairs, shining with greyish silky sheen under reflected light. Carapace a little longer than patella and tibia of 1st and of 4th leg, longer than tarsus and protarsus of 4th and than patella, tibia, and tarsus of palp; its width equal to length from tubercle to posterior emargination and to femur and patella of 3rd leg, and to femur and one third of patella of 4th leg; a transverse depression in front of fovjea, marking off a transversely oval tubercle. Mandibles tubercular in front. Legs 4, 1,2, 3; 4th exceeding 1st by nearly half its tarsus ; patella and tibia of 4th not longer than of 1st; 4th leg not in any sense thickened, femur more than three times as long as high (25 : 7*8), thicker than patella, which is considerably thicker and higher than tibia ; tibia slightly concave below and in the basal half above, more than three times as long aud wide as high (17*8 : 5*2); length of upperside of patella more than twice its height or width. Measurements in millimetres.-Total length 74; length of carapace 34, wddth 30 ; length of palp 49, of 1st leg 81, 2nd leg 72, 3rd leg 67, 4th leg 88; patella and tibia of 1st 33, of 4th 32 ; tarsus and protarsus of 4th 31. Loc. Jebba, Upper Niger (Lieut. Abadie). Becognizable from tbe other known species of the genus by its large size, darker colouring, and by having the 4th leg unmodified, not thicker than the 1 st, and only exceeding it in length by less than half its tarsus. HYSTEROCRATES ROBUSTUS, sp. n. 2 . Colour olive-greenish brown, with reflexions of greyish-white pubescence. Carapace considerably longer than wide, the width equal to the distance between the ocular tubercle and the median emargination ; the length equal to that of patella and tibia of 4th leg, greater than those of 1st and greater than tibia and protarsus of 1st; the width |