254 Mr. li. I. Pocock on 



African species. The Museum possesses nine specimens, 

 five males and four females — one from Fernando Po, one 

 from Onitsha, one from Gambia, two from Fantee, one from 

 the Gold Coast, the rest labelled West Africa. The largest 

 specimen (female) measures 182 millim. from the margin of 

 the cephalothorax to the end of the tail. The number of 

 pectinal teeth varies from fifteen to eighteen, but is usually 

 sixteen; the hairs upon the chelse and legs vary much in 

 number and length. The granules also vary considerably in 

 coarseness and distribution. 



Scorpio imperator (C. Koch). 



1842. Buthus imperator, 0. Koch, Die Arachniden, ix. p. 1, fig. 695. 

 1877. Pcmdinus imperator (C. Koch), Thoiell, loc. cit. p. 130. 

 1880. Scorpio imperator (C. Koch), L. Becker, loc. cit. p. 138, pi. ii. 

 fig. 2. 



Writing in 1880 Mons. L. Becker says : — " On ne connatt, 

 je crois, que trois exemplaires de cette esp^ce : (1) le type de 

 C Koch appartenant au Musde de Berlin ; (2) un exem- 

 plaire faisant partie de la collection de M. Simon ; (3) un 

 individu que j'ai pu acqu^rir, appartenant actuellement au 

 Musee de Bruxelles." To this list I can add one more, 

 belonging to the British Museum. It is a male from West 

 Africa, obtained by Captain Birch, R.N. It has four distinct 

 ocelli upon the left side, the supplementary ocellus being 

 developed in front, as if to make up for the backward position 

 of the central lateral ocellus, a feature which is so character- 

 istic of this species. 



Synoptical Table of Species. 



a. Upper surface of hand conspicuously concave to- 



wards the base of the immovable finger ; ante- 

 rior margin of hand smooth; width of hand 

 greater than length of cephalothorax cavimanus, sp. n. 



b. Upper surface of hand not distally concave ; an- 



terior margin granular or denticulate ; width 

 of hand not greater than length of cephalo- 

 thorax. 

 o'. Width of first caudal segment less than the 

 width of the vesicle and equal to the height 



of it exitialis, sp. n. 



b^. Width of first caudal segment greater than 



width of vesicle and still greater than the 



height of it. 



a^. Humerus somewhat rounded off in front; 



its anterior surface not separated by a 



strong ridge from the upper and under 



surfaces maurus^ Linn. 



