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



tained by Mr. George Wilson ; sandy steppes south of Tzavo, 

 five more or less mutilated specimens — an adult male, three 

 females, and a young. 



The females vary but little in structure, except that the 

 legs and palpi are darker in colour and the sides of the cara- 

 pace distinctly yellowish in the smaller examples ; a very 

 young specimen measuring only 46 millira. has the bands 

 much narrower and the upper caudal crests smooth. The 

 pectinal teeth are usually 18. 



The males, on the contrary, differ considerably from the 

 females. The tail is a little longer ; the chela?, however, are 

 neither longer nor thinner, but the movable digit is fur- 

 nished with a large lobe-like tooth, which fits into a corre- 

 sponding notch on the immovable digit. The terga also are 

 very distinctly though finely granular, and the carapace is 

 not so smooth above ; the pectines, though larger, do not 

 appear to be furnished with a greater number of teeth, one 

 specimen possessing 17 on each side and the other 18. 



This interesting new Scorpion is allied to Scorpio exitialis, 

 Pocock *, from Shoa, in Abyssinia : but in exitialis the hand 

 is entirely covered with tubercles, which are more granu- 

 liform than in Gregorii; the lower surface of the hand is 

 furnished with two strong granuliferous crests ; the lower 

 surface of the humerus is coarsely granular, the upper caudal 

 keels are not strongly denticulate, and, lastly, on the tarsal 

 lobes there are 3 spines, one above on the extremity of the 

 lobe, and the others below in the same position as those on 

 the tarsi of Gregorii. There seem, moreover, to be fewer 

 spines on the lower surface of the foot, since on the inner side 

 of the last tarsus there are only 4 spines, the distal of these 

 being further from the inferior one on the lobe than in 

 Gregorii. In the adult male of exitialis, moreover, the vesicle 

 is enormously enlarged, as I have previously stated. Since 

 writing the description, however, I have had the opportunity 

 of examining two additional examples of exitialis from Shoa. 

 These are both young, the larger measuring 95 millim. and 

 the smaller 80. In both the vesicle is small and there is a 

 tendency on the part of the granules on the hand to run into 

 crests on the external side, and there are 22 — 23 pectinal 

 teeth. 



The two species now under discussion are strikingly nearly 

 allied to Sc. arabicus and Sc. pallidas of Kraepelin ; the 

 former, indeed, recorded from Homrau, in Arabia, is very 

 difficult to distinguish from Sc. exitialis, of which it might 



* Ann. & Mag. Nat. Hist. 1888, ii. p. 249, J • 





