318 Mr. W. E. de Winton on 



Colour of incisors orange above, honey-coloured below. 



The type is a somewhat young specimen, the skulls of 

 older individuals reaching about 2 millim. more in total 

 length. 



The nearest ally of this mouse is 3Tus erythroleucus^ from 

 West Africa ; though outwardly differing in colour, the skull 

 shows close affinities. 



There is one female in the collection, but unfortunately the 

 mammae are not traceable ; but, judging from the strong 

 likeness in the skulls, there is little doubt that, like its ally, 

 this new mouse is of the multimammate group. It will bear 

 the name of the country in which it is found. 



9. Mus Jacksoniy sp. n. 



Pelage composed solely of soft fur ; the whole of the 

 upper parts smoky brown, showing a little more golden on 

 the cheeks and sides ; underparts grey. All the hairs of 

 the body are slate-coloured for the greater part of their 

 length, only the extreme tips being coloured, those above with 

 brown and those beneath with white. Ears dark, naked, and 

 very long. Tail much longer than the head and body, thin, 

 naked, and unicoloured brown. Feet and hands very long, 

 greyish. 



Measurements, taken from dried skin: type, J*, Entebbi 

 (Ntebe), 10. 2. 95 :— Head and body 78 millim.; tail 118; 

 hind foot 22 ; ear 14. 



Skull (base broken) : point of nasals to lambda 22 millim. ; 

 greatest breadth 11*5, of brain-case 11; nasals 9; basal 

 length 22; henselion to back of palate 11*5; palatal fora- 

 mina 6x2; outside "'^- ^ 6, inside ™^- ^ 3 ; molar series 4'6 ; 

 diastema 7. 



Molars large, all well developed, last two together fully as 

 long' as first. 



I'he length of the ears, tail, and hind feet at once distin- 

 guishes this species from all its congeners; it is, indeed, both 

 in colour and shape, strikingly like a diminutive Malacomys 

 Jongipes, and I know no true AIus to which it is at all nearly 

 allied. 1 name it in honour of the collector. 



It is highly probable that this mouse may prove to be iden- 

 tical with Dr. Noack's Myi^tromys longicaudatus (Zool. Jahrb. 

 ii. p. 246, 1887), which belongs undoubtedly to the genus 

 Mus^ as is shown by the figures given of its skull and teeth. 

 This being the case, the specific name need not be considered, 

 as it is already occupied. 



10. ArvicantMs Spehei^ sp. n. 

 In coloration and general pattern of the markings re- 



