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Show 1899.] AND SPIDERS F R O M TROPICAL WEST AFRICA. 881 pairs with coxae, trochanters and femora, patellae, and basal half tibia? yellow, clouded or marbled with black ; distal half of tibiae and protarsi black, slightly variegated with yellow, tarsi yellow ; 3rd and 4th legs black, with tarsus and basal half of femur yellow, and the rest of the segments varied with yellow marks ; sternum yellow, clouded with black ; upperside of abdomen black in its anterior half, with a median yellow stripe, the posterior half reddish brown in the middle, jet-black on the posterior angles ; a large yellowish-green triangular patch spreading in from the sides in front of the posterior angles ; sides of abdomen whitish yellow ; ventral surface yellowish brown, varied with black markings. Carapace a little excelling tibia of 1st leg in length ; flat above, not elevated posteriorly as in rugosa, the tubercles high and conical; eyes of anterior line a little more recurved ; median ocular quadrangle more narrowed anteriorly than in that species. Legs longer than in rugosa; the tibia of 1st and 2nd pairs more strongly bowed; tubercles on femora larger; spines on protarsi more numerous and longer, those on upperside of the segment formiug a distinct long pectinated series, which distally largely overlaps the base of the tarsus. Abdomen widest along its posterior border, which is truncate ; width across the middle less than the length ; width across posterior angles exceeding the length; tubercles large and conical, not low as in rugosa. Vulva consisting of a median anteriorly narrowed piriform lobe, lodged in a depression bounded by a semicircular border. Measurements in millimetres.-Total length 9 ; length of carapace 4*2, width 3*8 ; length of abdomen 5, width posteriorly 6. Loc. Benito Biver (67. L. Bates). Easily recognizable from P. rugosa by the variegated colouring, stronger tuberculation, longer anterior legs, &c. Genus THOMISUS Latr. THOMISUS TRIPUNCTATUS Lucas. Thomisus tripunctatus, Lucas, in Thomson's Arch. Ent. ii. p. 400, pl. xii. fig. 3 (1863). Loc. Sierra Leone (Surg.-Capt. Clements), and subadult specimens probably referable to this species from the Benito Biver (67. L. Bates). Genus PLATYTHOMISUS Dol. PLATYTHOMISUS NIGRICEPS, sp. n. (Plate LVIII. fig. 32.) 2 . Colour. Carapace coal-black, with narrow yellow margin at the sides and posteriorly ; mandibles, maxilla?, labium, and sternum black; palpi yellow, infuscate quite at tip of tarsus; coxa? and trochanters of all the legs yellow; femora of 3rd and 4th pairs also yellow except for a black apical ring ; femora of 1st and 2nd pairs deeply infuscate, yellow quite at base ; remaining segments of all |