Mr. J. Blackwall on new Species of Spiders. 451 



the same division of the body as those preceding it. It may 

 even be taken as a rule that all the lower Crustaceans (Xiphura, 

 Branchiopoda, Ostracoda^ Copepoda, and Cirripedia) have typi- 

 cally two pairs of foot-jaws, never more, vi^hile the Malacostraca 

 have either three pairs or only one pair, — and, further, that the 

 former have only one pair of maxillse, while the Decapoda and 

 other Malacostraca have generally two pairs. 



" Thus in order to obtain at the same time a uniform and prac- 

 tically useful terminology for the class Crustacea, it seems to 

 me advisable to abolish in that group the utterly meaningless 

 divisions thorax and abdomen, and to ad(^t those which I have 

 now put forward, viz. head, ti'unk, and tatl."^ 



LVII. — A List of Spiders captured in the South-east Region of 

 Equatorial Africa ; with Descriptions of such Species as ap- 

 pear to he new to Arachnologists. By John Blackvtall, 

 F.L.S. 

 My friend Mr. Meade having transmitted to me for examination 

 a second collection of spiders, made in the south-east region of 

 equatorial Africa by the late Mr. Richard Thornton and Mr. 

 Horace Waller, the result of my investigation of the specimens 

 contained in it is given in the following list. 



Tribe Octonoculina. 



Family LYCOSiDiE. 



Genus Ctenus, Walck. 



Ctenus vagus, n. sp. 



Length of the female 1^ inch ; length of the cephalothorax f, 

 breadth ^ ; breadth of the abdomen f ; length of an anterior 

 leg 2^ ; length of a leg of the third pair 1|. 



The eyes are disposed on the anterior part of the cephalo- 

 thorax in three transverse rows ; the two anterior ones, with the 

 two intermediate ones of the four constituting the second row, 

 describe a trapezoid whose shortest side is before ; and each of 

 the two eyes forming the posterior row, with a lateral one of 

 the second row, is seated on a tubercle ; the intermediate eyes 

 of the second row are the largest, and the lateral ones, which 

 are in a line with them, much the smallest of the eight. The 

 cephalothorax is compressed before, truncated in front, rounded 

 on the sides, which are depressed and marked with furrows 

 converging towards a narrow indentation in the medial line of 

 the posterior region ; it is clothed with short brownish-yellow 

 hairs, and is of a dark reddish-brown colour, with narrow, brown 

 lateral margins. The falces are powerful, conical, vertical, ami 



