1902.] MAMMALS FROM TRirOLI. H 



of brain-case 12"2 ; palate, length lo"5; diastema 7"4 ; palatal 

 foramina. 7 ; length of upper molar sei'ies 4'1. 



Habitat and Type as given above. 



This species is smaller and gi-eyei' than A . cUmidiatus, paler and 

 more rufous than A. cahirinits. It repi'esents the most westerly 

 I'ecorded locality of the genus Acomys in Northei^n Africa. 



Mr. Dodson tells me that these Spiny Mice, comparatively 

 dark among their pallid neighbours, resemble the small blackish 

 stones which lie about among the Soda Mountains, but wei-e not 

 elsewhere met with in the region traversed, 



16. Jaculus gerboa Oliv. 

 164. J. Sidi Faradje. 6/8/1. 



17. Jaculus jaculus L. 



62. Attich Loumonileh, 



118.120. Oumsinerma. 10-12/7/1. 



As usual, Jerboas are far less numerous in the collection than 

 fiei'billes, and at present material does not exist for an exact 

 comparison of Algerian, Tripolitan, and Egyptian specimens. 



Mr. de Winton has pointed out to me that the names Jaculus 

 for the genus and Jaculidfe for the family must stand instead of 

 Dipus and Dipodidse. 



18. Ctenodactylus vali, sp. n. 

 13. Wadi Bey. 19/4/1. 



104. W. Titti, east of Sokna. 27/6/L . ' 



External characters very much as in C. guncli. General colour 

 approximately pinkish buff above, nearly white below, the hairs 

 dull slaty basally. Face rather paler than body. Ears light 

 cream-colour, their edges scarcely blackened. Upper surface of 

 hands and feet and whole of tail pale cream- colour. Tail thin, 

 shorter than the foot, its terminal hairs about 20 mm, in length. 



Skull in general shape as in C. gundi, but with enormous 

 bull*, as in Massoittiera mzabi. Nasals long and narrow, little 

 l)roadened in fi-ont. Anteoi-bital projections comparatively 

 delicate. Interparietal of medium size, less broad than in gimdi, 

 Bullse enormous, but the opening of the meatus is visible outside 

 them in an upper view; anteriorly above they reach forward 

 nearly to touch the w^ell-developed postero-external projection of 

 the zygomatic pi'ocess of the squamosal ; medially their anterior 

 half extends on the upper surface to within 7 mm. of the middle 

 line, and their posterior half to within 4"5 mm. ; posteriorly they 

 project far behind the occipital plane, which is only 7 mm. wide 

 between them. Paroccipital processes compai-atively small. 

 Palatal foramina as in C. gimdi. Posteiior nares narrow, 

 angular. Molars small and delicate, shorter antero-posteriorly 

 thaji in C. gundi, the last molar less distinctly L-shaped than in 

 that species, and to that extent marking a slight step towards the 

 condition in MassoiMiera, 



