Mr. R. I. Pocock on East- African Scorpions. 431 



h'\ Seven median rows of teeth on movable digit ; 

 tail entirely smooth ; the keels exceedingly- 

 feeble, only minutely crenulate ; last abdo- 

 minal sternite smooth, without crests ; trunk 

 yellow, ornamented above with longitudinal 

 black bands j legs also slightly variegated . . pictus, sp. n. 



Family Scorpionidae. 



Scorpio cavimanus, Poc. (PI. XVIII. figs. 2,2 a.) 

 Scorpio cavimanus, Poc. Ann. & Mag. Nat. Hist. ii. p. 247 (1888). 



When I described this species about eight years ago I had 

 but a couple of specimens tor examination — one obtained by 

 Mr. F. J. Jackson near Kilima Njaro, and the other by 

 Capt. Speke near Umyamuezi. Since then the British 

 Museum has been enriched by the receipt of several more 

 specimens, and amongst tliem two mutilated males obtained 

 by Dr. Gregory at Kinani and a place 4 miles to the south 

 of it. These specimens agree with the types, so far as can 

 be judged from tlieir condition, except that the hands of the 

 chelae are not so wide as the length of the carapace, the 

 measurements being in one case 17*5 : 16"5 and in the other 

 3 6-5 : 15-5. The pectinal teeth are 14 — 14 and 15—16. 



What I regarded originally as one of the most distin- 

 guishing characteristics of this species is the curious depression 

 on the upperside of the hand at the base of the immovable 

 finger. This feature I now believe to be a mark of the adult 

 male ; at least it is conspicuous in all the six males that I 

 have seen (examples varying in length from 76-110 millim.), 

 but is absent in the one specimen of the female sex that the 

 Museum possesses. The latter was obtained, together with a 

 couple of males, at Ugogo, halfway between Zanzibar and 

 Tanganyika, by Mr. E. J. Baxter ; she measures 92 millim. 

 in length, has 13 pectinal teeth on each side, the hand more 

 coarsely punctured than in the male, but without a depression. 

 The tail is less than three times the length of the carapace, 

 whereas in the males it is more. 



Prof. Kraepelin (JB. Hamburg. Anst. xi. pp. 67 and 69) 

 regards Scorpio cavimanus as a " form " of the Abyssinian 

 Sc.hellicosus of L. Koch from Habab, which, in its turn, is but 

 a subspecies of the great West- African Sc. africanus, Linn. 

 For myself, however, I prefer to consider even cavimanus and 

 heUicosus as distinct until accurately sexed specimens of the 

 latter are brought to light. From the number of its pectinal 

 teeth (19 or "20) I should be inclined to think the type of belli- 

 cosus must be a male ; but, if so, there is no evidence that the 



