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Show 864 MR. R. i. P O C O C K O N SCORPIONS, PEDIPALPS, [NOV. 14, 3 pairs of inferior spines, 2 behind, 2 in front, and 1 above ; femora serially spined above. Abdomen oval, as wide as high, not twice as long as broad. Vulva as in figure. Measurements in millimetres.-Total length 30 ; length of carapace 13, width 10; length of ocular area 3, posterior width 4; length of palpus 16, of 1st leg 52, of 2nd 51, of 3rd 39, of 4th 48 ; patella and tibia of 1st 19*5, of 4th 17. The two known species of this genus, P. canescens aud P. vulpina Simon (Ann. Soc. Ent. Belg. xiii. p. 10, 1898), from the Congo, are too briefly described to be identifiable. Both are smaller than P. ferox, P. canescens being 20 m m . long and P. vulpina 22 m m. Genus THALASSIUS Simon. THALASSIUS GUINEENSIS (Lucas). (Plate LVII. fig. 18.) Olios guineensis, Lucas in Thomson's Arch. Ent. ii. p. 405, pl. xiii. fig. 6 (1S58). 2 • Colour. Carapace with narrow black rim, covered above and laterally with a mixture of white and brown hairs, sometimes the white predominating, sometimes the brown; no distinct white marginal or submarginal band; the clypeus the same tint as the sides of the bead; abdomen a deep rich-brown or greyish brown above, darker behind than in front, covered with a mixture of whitish and reddish-brown hairs, sometimes the white, sometimes the brown predominating; ornamented with four pairs of symmetrically-disposed blood-red patches, the posterior patches often indistinct ; no lateral pale band; lower surface tolerably uniform yellowish brown; legs a tolerably uniform greyish or brownish hue, not banded; the protarsus sometimes darker at the tip. Carapace just about equal to tibia of 1st and to tibia and protarsus of 4th leg ; longer by about one-fourth of the tarsus than metatarsus of 1st; its upper surface flat, as high behind as in front. Legs robust, thickly plumose, 4, 1 and 2, 3 in length ; patella and tibia of 4th a little less than those of 1st, and distinctly less than those of 2nd. Lateral lobes of vulva long, oblique, converging posteriorly and meeting in a short median suture; the depression between them semioval, widely open in front, and filled in with a completely chitinous irregular sclerite (see Plate LVII. fig. 18). o* • Besembling $ in colour ; legs much longer, but equally strongly plumose. Palp when extended not reaching apex of femur of 1st leg; its tibia subcylindrical, unarmed ; tarsus piriform, shorter than patella and tibia taken together. Measurements in millimetres.- $ . Total length 24; length of carapace 11, of 1st leg 42, 2nd leg 42*5, 3rd leg 39, 4th leg 44. d • Total length 22 ; length of carapace 10, of 1st leg 52, 2nd 52*5, 3rd 48, 4th 54. Loc. Benito Biver (G. L. Bates). This species has apparently not been rediscovered sin ce Luca |