1899.] AND SPIDERS FKOM TROPICAL WEST AFRICA. 881 



pairs with coxae, trochanters and femora, patellae, and basal half of 

 tibiae 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. 



Carajjace a little excelling tibia of 1st leg in length ; flat above, 

 not elevated posteriorly as in rugom, the tubercles high and conical ; 

 eyes of anterior line a little more recurved ; median ocular quad- 

 rangle more narrowed anteriorly than in that species. 



Legs longer than in rrigosa ; 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 

 forming 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 cai'apace 

 4-2, width 3*8 ; length of abdomen 5, width posterioi'ly 6. 



Loc. Benito River {G. L. Bates). 



Easily i-ecoguizable from P. rugosa by the variegated colouring, 

 stronger tuberculation, longer anterior legs, &c. 



Genus Thomisus Latr, 



Thomisds tripunctattts Lucas. 



Thomisus tripunctatus, Lucas, in Thomson's Arch. Ent. ii. p. 400, 

 pi. xii. fig. 3 (1863). 



Loc. Sierra Leone {SuFg.-Capt. Clements), and subadult specimens 

 probably refei'able to this species from the Benito River (G. L. 

 Botes). 



Genus Platithomisus Dol. 



Platythomisus nigbiceps, sp. n. (Plate LVIII. fig. 32.) 



$ . Colour. Carajjace coal-black, with narrow yellow margin at 

 the sides and posteriorly ; mandibles, maxillae, labium, and sternum 

 black ; palpi yellow, infuscate quite at tip of tarsus ; coxae 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 



