432 Mr. R. I. Pocock on East- African Scorpions. 



upperside of the hand is excavated in the manner charac- 

 teristic of cavimanus, and the tail is evidently very much 

 shorter. 



In all the examples that I have examined the spine- 

 armature of the feet is very constant, consisting of but 7 

 spines, 4 on the posterior border and 3 on the anterior, in 

 both cases there being 2 on each lobe, one in its middle, the 

 otlier on its inferior angle, while the apex of the lobe is 

 furnished with stout spiniform bristles, which, when fractured, 

 resemble small spin( s. The same spine-armature is found in 

 the other East-Afr'can species known to me, namely Scorpio 

 viatoris, Poc. (An •. & Mag. Nat. Hist. 1890, vi. p. 100), 

 which was described from a specimen obtained by Emin 

 Pasha, ticketed merely East Africa. Since then the Museum 

 has received a couple of adult examples (male and female) 

 from Zomba, Lake Nyassa (/7. H. Johnston). These two 

 show that the sexual characters of this species are very 

 different as regards the chelae from those of Sc. cavimanus, 

 the chelae of the male, instead of being larger than those of 

 the female, are longer and lighter, with tlie hand only as wide 

 as the length of the hand-back. The female has the sculp- 

 turing of the hands stronger and the tail shorter, the first and 

 second segments being shorter than the carapace, whereas in 

 the male they are rather longer. The male has 13 — 14 

 pectinal teeth, the female 13 — 13 ; whereas a young female 

 (77 millim.) from Fwambo (A. Carson) has 14. The adult 

 male measures 105 millim., the female 100, the carapace in 

 both cases being 16, the tail in the male 60, in the female 52. 

 The terga are much more coarsely granular than in cavi- 

 manus, and the crests which are so conspicuous on the lower 

 surface of the anterior caudal segments and of the last abdo- 

 minal sternite in cavimanus are weak or obsolete in Sc. 

 viatoris. 



Scorpio Gregorii, sp. n. (PI. XVIII. figs. 3, 3a.) 



Colour a uniform olive-brown ; legs dark reddish brown, 

 hand of chelae paler reddish, fingers deep blackish green. 



Carapace, about equalling the first and second caudal seg- 

 ments in length ; the median eyes well behind the middle ; 

 the anterior border with a median semicircular excision ; 

 carapace smooth towards the middle, sparsely punctured, 

 distinctly granular at the sides ; a row of setiform punctures 

 along the anterior and posterior borders. 



Terga smooth, somewhat coarsely but very sparsely punc- 

 tured, the last coarsely granular at the sides, with traces of 

 two crests. 



