Oeiierk Arrangement of the African Squirrels. 473 

 8. Atlantoxeeus. „ 



Type. 

 Xerus, subg. Atlantoxerus, Major, P. Z. S. 1893, p. 189. . A. getulus. 



Skull broad, low, and depressed ; the forehead flat. 

 Zygomata widely expanded. 



Clseek-teeth -, if well developed, standing in front of the 



middle of />", which is much smaller than ?»'. 



Molars bracliyodont, at least as compared with those of 

 Geosciurus and Euxerus^ simple in structure. 



Range. N. Africa, Morocco, &c. 



9. Xerus. 



SciuruSj subg. Xerus, Hempr. & Ehrenb. Symb. Phy.g. Type, 



i. text to pi. ix. (1832) X. hrachyotus. 



Skull much more bowed than in Atlantoxerus, its upper 

 profile convex. Zygomata rather less expanded. 



Cheek-teeth ., p^ little smaller than m'. 



Molars brachyodont, simple. 



Range. N.E. Africa (Abyssinia, Somali, and E. Africa). 



10. Geosciurus. 



Geosciurus, A. Smith, S. Afr. Quart. Journ. ii. p. 128 Type. 



(1834) G. capensls *. 



Skull large, heavy, bowed, with very thick zygomata. 

 Postorbital processes thick, short, directed backwards close 

 to the hinder end of the orbito-temporal fossa. 



Cheek-teeth - ; p^ large, rounded. 



Molars very heavy, hypsodont, rounded. 

 Range. South Africa, western half. 



11. EUXERUS. rr 



Type, 



Geuus novum t E. erythropus 



{Sciurus erythi-opus, Geoff.)_ 



Skull high, long, narrow; the zygomata very little ex- 

 panded, in marked contrast to those of the other three genera 



* Palmer (Index Mamra, p. 294) states that the type of Geosciurus is 

 Geoffrey's Sciurus erythropus, but he must have been deceived by the 

 somewhat unusual typography of Smith's paper. The S. African species 

 is clearly the type. 



t In Palmer's Index (p. 668) Rafinesque's genus Tenotis is stated to 

 have " Sciurus erythropus " as its type, but I fear that the rules do not 

 admit of this allocation. For, firstly, that species (which Rafinesque 



Ann. & Mag. xV. Lliat. Ser. 8. Vol. iii. 33 



