1899.] AND SPIDERS FBOM TROPICAL WEST AFEICA. 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 ;••• indff^is. 



b. Carapace high and more conyex behind, level along upperside ; 



cephalic area not higher tlian thoracic. 

 a\ A broad yellow lateral stripe extending from side of head 

 to spinners, 

 o^. Legs yellow, strongly banded with black ; patella black . . regalis. 

 b-. Legs yellowish brown, at most spotted above with white. 

 a^. Upperside of legs ornamented with silvery white spots 

 and bands, white spots also on upperside of abdomen 



above yellow band - '•■•• leiccost ictus. 



b^. Upperside of legs and abdomen not spotted with white. 

 a*. Lateral lobes of vulva in contact, not separated 



niesially by a shining hairless sclerite konensis. 



i*. Lateral lobes of vulva separated posteriorly in the 



middle Une by a shining hairless sclerite bated. 



bK No definite longitudinal yellow band extending from head 

 to spinners. 

 a'. Legs robust, thickly plumose distally ; lateral lobes of 

 vulva elongate, obliquely converging, and meeting poste- 

 riorly in a very short suture. 

 a^. Legs and upperside of abdomen strongly banded ; 



clypeus darker than side of head formosus. 



¥. 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. 

 a'. Upperside of thorax and abdomen nearly uniformly 



golden yellow ; legs chocolate-brown aiiraius. 



b''. Upperside of thorax and abdomen covered with 

 brown and yellow hairs ; legs pale, covered with 

 greyish-white hairs inornatiis. 



The following West-African species are unknown to me : — 

 T. spinosissimus Karsch (Zeits. gesammt. Naturwiss. lii. p. 345, 

 1879), described as a Gte^ius from the Loango coast, will fall 

 apparently under section 6' of the above table ; but seems to 

 differ from both T. batesi and 2\ leonensis in ha^ang the brown lield 

 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. xlii. p. 17, 1898), from 

 0<^owe, will according to colour characters fall under section a or 

 a^ 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, 



G-enus Dolomedes Latr. 



DoLOMEDES TRANSFUGA, sp. n. (Plate LVII. fig. 24.) 

 cJ . Colour a tolerably uniform yellowish brown ; carapace covered 

 above with olive-brown hairs, with a broad marginal snow-white 



