miller] seventy new MALAYAN MAMMALS 33 



longer and narrower, and the interpterygoid space is narrower 

 throughout and less flaring anteriorly. Teeth as in Mus soccatus 

 and the members of the sabanus-vociferans group. 



Measurements. — External measurements of type: total length, 

 510 ; head and body, 235 ; tail vertebrae, 275 ; hind foot, 43 (41) ; ear 

 from meatus, 22.4; ear from crown, 17; width of ear, 16. 



Cranial measurements of type : greatest length, 54 ; basal length, 

 45.4; basilar length, 42.4; diastema, 14.8; length of incisive foramen, 

 7.8 ; combined breadth of incisive foramina, 3 ; length of nasals, 20 ; 

 least interorbital breadth, 9 ; zygomatic breadth, 14.6 ; mandible, 35 ; 

 maxillary toothrow (alveoli), 10; mandibular toothrow (alveoli), 11. 



Specimens examined. — Six, all from Tana Masa, Batu Islands. 



MUS BALJE sp. nov. 



Type. — Adult female (skin and skull), No. 121,781, United States 

 National Museum. Collected on Tana Bala, Batu Islands, Sumatra, 

 February 12, 1903, by Dr. W. L. Abbott. Original number, 2274. 



Characters. — Like Mus masce but not as large ; skull with relatively 

 broader rostrum. 



Color. — The color so closely resembles that of Mus masce as to 

 need no special description. 



Sknil and teeth. — The skull is like that of Mus masce, but the 

 general size is rather less, and the rostrum is actually as well as 

 relatively more robust. Interpterygoid space wider and more ex- 

 panded anteriorly than in the related species. 



Measurements. — External measurements of type : total length, 

 465; head and body, 227; tail vertebrae, 238; hind foot, 41 (38.6) ; 

 ear from meatus, 23; ear from crown, 18; width of ear, 17. 



Cranial measurements of type : greatest length, 52 ; basal length, 

 44 ; basilar length, 42 ; diastema, 14 ; length of incisive foramen, 8.2 

 combined breadth of incisive foramina, 3.4; length of nasals, 20 

 least interorbital breadth, 9 ; zygomatic breadth, 25.4 ; mandible, 32 

 maxillary toothrow (alveoli), 9.4; mandibular toothrow (alveoli), 



9-8. 



Specimens examined. — Two skins and five skulls, all from Tana 



Bala. 



MUS LUGENS sp. nov. 



Type. — Adult female (skin and skull), No. 121,533, United States 

 National Museum. Collected on North Pagi Island, Sumatra, 

 November 15, 1902, by Dr. W. L. Abbott. Original number, 2046. 



Characters. — A very large member of the Mus rattus group, some- 

 what closely resembling the Mus simalurensis of Simalur Island, but 



