1900.] INSECTS AND ARACHNIDS FROM SOMALILAND. 57 



the middle of the ocular tubercle. Terga closely and finely 

 granular throughout. Inferior keels of 2nd and 3rd cmidal 

 segments strongly dentate. Band smooth, with a pair of weak 

 and weaUly granulate crests on its upperside. 



Total length 50 mm. 



Loc. Zeyia in Xorth-west Somaliland (E. W. Oates). In British 

 Museum. 



BUTHUS CALVICEPS PoC. 



Gj-. supra, p. 54. 



BuTHUS ACUTECARiNATUs Simon. 



ButJins acuUcarinatus, Simon, Ann. Mus. Grenova, xviii. p. 245, 

 pi. viii. fig. 18 (1883). 



Loc. Zeyla {E. W. Oates). In British Museum. 

 Occurs also in Egypt and Arabia. 



BUTHUS POLYSTICTUS PoC. 



Buthus pohjsticius Pocock, Ann. Mag. Nat. Hist. (6) xviii. p. 178, 

 pi. xi. fig. 1 (1896). 



Goolis Mountains in Somaliland {E. Lori Phillips). In British 

 Museum. 



BUTHUS EMINI Pocock. 



Butlius eminii, Pocock, Ann. Mag. Nat. Hist. (6) vi. p. 98 

 pi. i. fig. 2 (1890) ; id. op. cit. (6) xviii. p. 179 (1896). 



Loc. Airaoea in the Boran Country, 3000 ft. (A. Donaldson 

 Smith). In British Museum. * 



This species and perhaps also B. jjolysticius may prove to be 

 subspecies of B. trilineatus Peters, described from Tete. 



The species and subspecies of Buthns mentioned above may be 

 diagnosed as follows : — 



a. Inferior lateral keels of 5tli caudal segment posteriorlj- 



lobate ; inferior median keels of 2nd and 3rd with the 



granules enlarged towards the posterior end. 



a\ Carapace without distinct median, lateral, and 



posterior keels, inferior keels ou 4th caudal segment 



obsolete calviceps. 



b\ Carapace with distinct median posterior and lateral 

 keels, the posteriors turning outwards and uniting 

 with the laterals, inferior keels on 4th caudal segment 



developed ... oceitanus. 



a-. Legs, chelffi, and body uniformly yellow, not 

 lined with black ; intercarinal ocular area closely 



granular subsp. zei/lensis. 



U^. Chela' and body with black-lined keels, femora 

 of legs distally infuscate ; patellte also infuscate 

 basally and along keels ; frontal area of carapace 



sparsely granular in the middle subsp. berherensis. 



[55] 



