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Show 1899.] AND SPIDERS FROM TROPICAL WEST AFRICA. 869 The characters of the foregoing species of Thalassius may be tabulated as follows:- a. Carapace flatter and less elevated behind, cephalic region higher than thoracic; legs yellow, banded and spotted with black insignia. b. Carapace high and more convex behind, level along upperside; cephalic area not higher than thoracic. a1. A broad yellow lateral stripe extending from side of head to spinners. a2. Legs yellow, strongly banded with black ; patella black .. regalis. b2. Legs yellowish brown, at most spotted above with white. a'3. Upperside of legs ornamented with silvery white spots and bands, white spots also on upperside of abdomen above yellow band leucostictus. b3. Upperside of legs and abdomen not spotted with white. fl*. Lateral lobes of vulva in contact, not separated mesially by a shining hairless sclerite leonensis. b*. Lateral lobes of vulva separated posteriorly in the middle line by a shining hairless sclerite batesi. bl. N o definite longitudinal yellow band extending from head to spinners. a5. Legs robust, thickly plumose distally ; lateral lobes of vulva elongate, obliquely converging, and meeting posteriorly in a very short suture. ae. Legs and upperside of abdomen strongly banded; clypeus darker than side of head formosus. be. Legs and abdomen not banded ; clypeus same colour as sides of head guineensis. b'. Legs thinner, not thickly plumose ; lateral lobes of vulva subquadrate, meeting or nearly meeting in a long median suture. a1. Upperside of thorax and abdomen nearly uniformly golden yellow ; legs chocolate-brown auratus. b7. Upperside of thorax and abdomen covered with brown and yellow hairs; legs pale, covered with greyish-white hairs inomatus. The following West-African species are unknown to me :- T. spinosissimus Karsch (Zeits. gesammt. Naturwiss. Iii. p. 345, 1879), described as a Gtenus from the Loango coast, will fall apparently under section b1 of the above table ; but seems to differ from both T. batesi and T. leonensis in having the brown field of the upperside of the abdomen laterally spotted with white, perhaps as in T. leucostictus. The description, however, contains no statement to the effect that the legs are ornamental as in T. leucostictus. T. pictus, Simon (Ann. Soc Ent. Belg. xiii. p. 17, 1898), from Ogowe, will according to colour characters fall under section a or a6, resembling T. insignis in some respects ; but since M . Simon makes no mention of any peculiarity in the form of the carapace, it is not permissible to suppose that his species is identical with T. insignis. Genus D O L O M E D E S Latr. DOLOMEDES TRANSFUGA, sp. n. (Plate LVII. fig. 24.) j . Colour a tolerably uniform yellowish brown; carapace covered above with olive-brown hairs, with a broad marginal snow-white |