60 



PROVEEDINGS OF THE NATIONAL MUSEUM. 



Characters. — A small brig-ht-colored member of the Mns surifer 

 or()up,r(';ulilv distinguishable from JIus seruti/s, but somewhat closely 

 icscnibliiio- J/if.s .sxrifer of the Malay Peninsula, From this it ditiers 

 ill smaller size, relativel}^ larger teeth, and shorter, wider incisive fora- 

 mina. 



Color. — (xround color, between ochraceous and ochraceous-bufi', 

 becoming somewhat lighter on cheeks and front legs, slightly darker 

 on hind legs. Back somewhat clouded by the blackish tips of the 

 bristles, but sides almost clear. Under parts and feet bufiy white. An 

 ochraceous buti" collar in the type, and two other skins. 



Shull and teeth. — The skull and teeth resemble those of Mus surifer., 

 but the average size of the skull is less and that of the teeth greater. 



Measurements. — For external measurements see table, page 60. 

 Skull of type: Upper length, 43.6 mm.; condylobasilar length, 37; 

 basilar length, 34; palatilar length, 17.8; diastema, 12; breadth of 

 rostrum midwa}^ l)etween zj^goma and tip of nasals, 7; interorbital 

 constriction, 7; breadth of braincase above roots of zygomata, 16; 

 mandible, 21.1; maxillary tooth row (alveoli), 6.8; mandibular tooth 

 row (alveoli), 6.2. 



Specimens examined. — Eleven, all from Karimata Island. 



RemarTis. — Though strikingly different from its geographically 

 nearest ally, J/v/.s- serutus., this species rather closel}^ reseml)les the 

 mainland meml)er of the group. 



Measurements of Mas from the Karimata Islands. 



"Type. 



&TaiI imperfect. 



