African Specimens of the Genus Scorpio. 253 



Colour. — Very dark green or black above, with a reddish 

 tint 5 brownish beneath. 



Measurements in millimetres. 



Tail four times as loug as cephalothorax. 



Cephalothorax slightly shorter than the first two caudal segments. 



Length. Breadth. Height, 



rp , , J 166 (about 6i I 



^^^^^ j English inches ( 



Cephalothorax 22^ 25 



Tail, total 90 



First caudal segment 10^ 9j 8 



Fifth „ „ 19 7h 7 



Vesicle 11 8^ 7 



Aculeus 8 



Humerus 15 



Brachium 17 



Hand 23i 21^ 10 



Back of hand 14 



Movable finger 23 



Immovable finger . , 16:^ (at base) 7^ 



Pecten 8^ 



Pectinal tooth 2^ 



This scorpion rivals in size imperator and Roeseli, and to 

 both of them it bears considerable resemblance. It may, 

 however, be generally distinguished from both by the greater 

 coarseness of its granules and by the smaller number of 

 pectinal teeth ; and particularly from imperator by the position 

 of the central lateral eye, and from Roeseli by the fact that 

 the upper surface of the cephalothorax is furnished behind, on 

 each side of the middle line, with a conspicuous granular 

 prominence, the same area in Rceseli — at least in the series of 

 that species that I have seen — being depressed and nearly 

 always smooth ; further, the caudal intercarinal spaces are 

 smooth and the tubercles of the hand less pronounced and 

 more fused. 



The British Museum possesses two female specimens, one 

 from Fernando Po, presented by Capt. Birch, the other 

 labelled W. Africa from the collection of Mr. Dalton. 



Scorpio Roeseli (Simon). 



1871. HeteromeU'tis Roeseli, E. Simon, Rev. Mag. Zool. xxiii. p. 54, 



pi. vi. fig. 4. 

 1877. Pandinus africanus (Linn.), Thorell, Etudes Scorpiol. p. 128. 

 1880. Scorpio Hmseli (Simon), L. Becker, Ann. Soc. Ent. Belg. xxiv. 



p. 138, pi. ii. fig. 2. 



This appears to be the commonest, as it is the finest, AVest- 



