(4) 

 20. Mus muscuhis gentilis Brants. 



<? Ill ; ? II--', 11:5, 114. Kerma. 

 <J 173. Assonan. 

 (J 146. Merowe. 



21. Acomys witherbyi dc AVint. 



<S 25, 47, 72, 80 ; ? 26, Tl. Nakhcila. 



<? 123; ¥ 101. Kerma. 



c? 17. Shereik. 



? 132, 140. Merowe. 



At first sight these specimens appear to fall into two distinct gronjis, the one 

 fawn and the other slate-coloured ; but a comjiarison with the British Mnseum's 

 series of skins makes it evident that they must for the jjresent be considered as one 

 species, owing to the amount of intergrading that takes phice. 



As the fawn appears to be the more dominant colour, and the}' are all topotypes 

 of de Winton's icitherhi/i,* it seems best to refer the slaty specimens also to this 

 species until sufficient material is obtained to settle the question of the value of 

 colour as a character in the genus Acomj/s. 



The relationships of Acomys witherbi/i, hunteri and (/im/d/atus are, according to 

 Mr. W. E. de Winton.f as follows : — • 



A. tvitherbi/i is the smallest of the three, and less brightly coloured than 

 A. hunteri. Tlie latter is of a red fawn-colour above, with the underjiarts pnre 

 white, and is distinguished from A. dimidiatus by its shorter ears and hind feet. 



22. Arvicanthis testicularis Sund. 



c? 31, 34 ; ? 35, 52. Nakheila. 

 cT 10; ? 5,6, 8,0. Shereik. 

 S 136. Merowe. 

 ? 120. Kerma. 



23. Jaculus jaculus Linn. 



5 82, 121 ; ? 88. Kerma. 



6 179, 180. Natron Valley. 



24. Hystrix cuvieri Gray. 



? 36 ; 0, skull only. Nakheila. 



Owing to the difl'erence in size between the skulls of the South European 

 porcupines and those of the jiresent collection from Upper Egypt it seems advisable 

 to adopt Gray's name oi cuvieri, as suggested by Mr. de Winton.t 



Sknll No. 36 is considerably larger than No. 0, and bears some resemblance to 

 Jl. ijali'uta Thos. ; but until more material is obtained, the (juestion of whether tlie 

 two species occur together must be left undecided. 



* Nm. Zool. vol. viii. December lOUl, p. 400. 

 t .V(ir. Zovl. vol. viii. pp. -400 — 101.; 

 J /tmlogtj of Kijy2>f, p. 313. 



