408 Mr. 0. Thomas on new Malar/an Mammals. 



cinnus is shorter and broader anteriorly, the nasals especially- 

 being much broader, so that their greatest breadth is more 

 than half their length. 



In the dentition the minute anterior premolar (p^) of 8. 

 exilis, present in all the specimens as yet observed (at least 

 seven in number), is wholly absent in the type of >S'. con- 

 cinnus. The molars again are markedly broader and heavier, 

 the actual breadth of m^ being 1-4 millim., as compared to 

 1"0 millim. in 8. exilis. 



Dimensions of the type, an adult female (skin) : — 



Head and body (apparently rather stretched) 85 millim. ; 

 tail, without hairs, 59 ; hind foot 25*5 ; heel to front of last 

 foot-pad 11*4, to front of anterior digital pad 18*4; ear (con- 

 tracted) 4-8. 



Skull : basal length 19"6 ; greatest breadth 15 ; nasals, 

 length ?•], breadth 3*9 ; diastema 6"3 ; length of tooth-series 

 (front of p^ to back of m^) 3-8. 



Hah. Isabella, Basilan, Philippines {Prof. J. B. 8teere). 



This species is the fourth known member of the beautiful 

 little Malayan group of pigmy squirrels, the other three being 

 8. melanotis, Miill. & Schl., 8. Whiteheadi, Thom., and 8. 

 exilis, Miill. From the first it is readily distinguishable by 

 its uniformly coloured head and rufous back, from the second 

 by its untufted ears, from the third by the many important 

 although less obvious differences above detailed, and from all 

 by its possession of only a single upper premolar. 



3. Mus alticola^ sp. n. 



Fur mixed with spines both above and below. General 

 colour above a peculiar uniform bluish grey, not speckled or 

 grizzled. Hairs and spines creamy white basally, grey ter- 

 minally. Underside pale yellowish white, the hairs uni- 

 formly of this colour to their bases. Line of demarcation on 

 sides not sharply defined. Tail short-haired, sharply bicolor 

 from base to tip, brown above, yellowish white below. 



Dimensions : — Head and body (probably stretched) 177 

 millim. ; tail 162; hind foot 32. 



Skull : tip of nasals to " lambda " (junction of sagittal and 

 lambdoid sutures) 34 ; nasals, length 15 ; interorbital breadth 

 7*4; palate, length 19; anterior palatine foramina 6 ; length 

 of upper molar series 5*8. 



Hah. Mount Kina Balu, North Borneo {Mr. J. White- 

 head). 



This species is allied to the Nepalese M. niveiventer^ Ilodgs., 

 but may be distinguished by its unspeckled back, by the 



