some new African Spiders. 329 



6'. Processes on vnh^a long, slender, 

 submeuibranous, and svidely sepa- 

 rated iu the middle line Darlinyi, sp. u. 



^THRISCUS, gen. nov. 



Allied to JEthrodes, Poc. (P. Z. S. 1899, p. 861, pi. Iv. 

 fig. 2), but differing in the following characters : — 



a. Ocular quadrangle slightly longer than wide, parallel- 



sided; carapace with a single large tubercle just in 

 front of the fovea ; upperside of abdomen with six 

 pairs of tubercles in addition to those on the margin ; 

 seven pairs of tubercles along the anterior border, not 

 including the lateral, and nine sigilla along the anterior 

 border, as in Araruethra ; anterior lateral angles of 

 abdomen subrectangular, the angular tubercle not 

 larger or more prominent than the rest ^fhvodes. 



b. Ocular quadrangle considerably shorter than its anterior 



width, which much exceeds its posterior width ; cara- 

 pace with one small tubercle on a level with the 

 cephalic constriction ; upperside of abdomen with only 

 marginal or submarginal tubercles ; eleven sigilla along 

 the anterior border; a very large and prominent ante- 

 rior lateral tubercle, giving an acutely angular aspect 

 to this region of the abdomen Aithriscus. 



^thriscus olivaceus, sp. n. 



?. — Colour olive-brown; upperside of abdomen clear 

 olive-yellow, with darker margin. 



Upperside of abdomen flattish, smooth and shining, with 

 its anterior border straightish, lightly sinuous, the median 

 emargination shallow and furnished with a pair of contiguous 

 tubercles behind the middle third of the anterior border, 

 similar to but less prominent and less scattered than those of 

 ^throdes mammosa, the inner being close to the median 

 sigillum, the outer being separated from the inner by a space 

 impressed with two sigilla ; the posterior border of the upper 

 surface bearing a pair of somewhat widely separated sub- 

 median tubercles ; the anterior lateral tubercle subbifid, pro- 

 jectingdownwards and forwards ; close to the posterior border 

 immediately behind it there is also a large erect tubercle, 

 exceeding the others of the dorsal surface in size. 



Vulva exhibiting just in front of and below the generative 

 cleft a pair of widely separated oval apertures to the recep- 

 tacula seminis ; in front of these its surface rises into a 

 triangular process, the free arch of which is produced into a 

 slender forwardly directed scape. 



"Width of abdomen 15 millim. ; median length 7. 



Loc. Benito River, Congo (6r. L. Bates). 

 An?i. & Mag. N. Hist. Scr. 7. Vol x. 2\ 



