1899.] AKD SPrOEES PE.OM TROPICAL WEST AFRICA. 857 



tibiee of all with basal white band ; protarsus of 1st and 3rd black, 

 with basal band of 2nd and 4th white with black patch just 

 beyond middle. 



Carapace with superior and lateral tubercles longer than in 

 iwdulosa. 



Abdomen (in type-specimen) not distended, its anterior portion 

 low, nodular, not elevated. 



Vulva (as in figure PI. LVII. fig. 16) somewhat resembling that of 

 nodulosa,the anterior portion completely divided into a right and left 

 half by a deep median groove ; the chamber containing the two fossae 

 smaller, more transversely oblong, with anterior rim less arched. 



Total length 15-5 mm., width of head 7-5 mm. 



Loc. Benito Eiver (G. L. Bates). 



CiEEOSTRis TURRiGER, sp. n. (Plate LVII. figs. 15, 15 a.) 



Colour. Dorsal surface of carapace, legs, and abdomen a tolerably 

 uniform greyish brown, covered with a coating of yellow and white 

 hairs intermixed ; abdomen mottled with black spots and brownish 

 patches and lines ; legs coloured as in C. albescens, but the distal 

 spot on the protarsi reddish brown. 



Carapace with tubercles as in C. albescens. Abdomen with its 

 anterior portion elevated into a high, broad, subcylindrical pro- 

 minence, the summit of which is about one third broader than long, 

 with semicircularly rounded anterior tubercular border, and three 

 large tubercles on the posterior border. 



Vulva as in figure (PL LVII. fig. 15 a). 



Measurements in millimetres. — Total length 16 ; width of head 7; 

 height of abdomen from vulva to summit of prominence 13. 



Loc. Benito Eiver {G. L. Bates)-, also young specimens of pro- 

 bably the same species from Sierra Leone {Surg.-Capt. Clements). 



Somewhat resembling C. petersi Karsch from luhambane (Mon. 

 Ak. Berlin, 1878, p. 324, pi. i. fig. 7), in the elevation of the 

 anterior portion of the abdomen ; but in C. petersii the column 

 is narrower, with the summit rounded and not encircled with 

 tubercles. 



The three species of the genus knovni from the Benito Eiver 

 may be diagnosed as follows : — 



a. Femora of legs bright red ; tibiae of 2nd, 3rd, and 4th legs 

 with scarcely a trace of basal white band ; black underside 

 of abdomen ornamented with three pairs of silvery spots ; 

 upperside of abdomen velvety black, furnished with silvery 



lines and patches argostictus. 



h. Femora steel-blue ; tibiae of 2nd, 3rd, and 4th legs with broad 



white basal band below ; lower side of abdomen uniformly 



black, upperside dirty yellowish brown. 



a}. General colour of dorsal surface of body and legs white ; 



abdomen not elevated in front into a high thick 



column albescens. 



b^. General aspect dirty yellowish brown ; abdomen elevated 



in front into a broad thick column turriger. 



