NO. 21 FIFTY-ONE NEW MALAYAN MAMMALS — MILLER IJ 



Remarks. — This is a large, south-Peninsular representative of 

 Epimys tirmus. It is readily distinguishable from E. validus of 

 Trong by the relatively smaller teeth with less developed enamel folds. 

 The Mus muelleri foederis of Robinson and Kloss, from Selangor, is 

 described as a much smaller animal with greatest length of skull in 

 adult female only 48 mm. 



EPIMYS POLLENS, new species 



1906. Mus tirmus Lyon, Proc. U. S. Nat. Mus., vol. 31, p. 594. December 18, 

 1906. (Not of Miller.) 



Type. — Adult male (skin and skull), No. 124691, United States 

 National Museum. Collected at Tanjong Rengsam, Banka", May 22, 

 1904, by Dr. W. L. Abbott. Original No. 3251 ». 



Diagnosis. — Like Epimys Hrmus of the Rhio-Linga Archipelago, 

 but tail longer and skull differing from that of all the other known 

 members of the group in the very abruptly constricted interorbital 

 region and weak anterior portion of zygoma. 



Measurements. — Type: head and body, 247 mm.; tail, 307; hind 

 foot (dry), 48.7 (46.2) ; condylobasal length of skull (teeth mod- 

 erately worn), 51.7; zygomatic breadth, 26.0; interorbital constric- 

 tion, j."/ ; occipital breadth, 19.9 ; depth of braincase, 14.4 ; nasal, 21.0 ; 

 diastema, 15.0; mandible, 33.3; maxillary toothrow (alveoli), 9.1; 

 mandibular toothrow (alveoli), 9.0. 



Speeimcns examined. — Four, all from Banka. 



EPIMYS POTENS, new species 



Type. — Adult female (skin and skull), No. 1 14384, United States 

 National Museum. Collected on Pulo Tuangku, Banjak Islands, 

 February 5, 1902, by Dr. W. L. Abbott. Original No. 15 16. 



Diagnosis. — Like Epimys Hrmus but tail shorter (about equal to 

 head and body instead of distinctly longer) and cheek teeth smaller. 



Measurements. — Type : head and body, 245 mm. ; tail, 240 ; hind 

 foot (dry), 46.5 (43.5) ; condylobasal length of skull (teeth moder- 

 ately worn), 48.8; zygomatic breadth, 25.8; interorbital constriction, 

 7.9; occipital breadth, 18.8; depth of braincase, 14.6; nasal, 19.7; 

 diastema, 14.6; length of incisive foramina. 8.9; mandible, 32.3; 

 maxillary toothrow (alveoli), 8.6; mandibular toothrow (alveoli), 

 8.2. 



Specimens examined. — Five, all from Pulo Tuangku. 



Remarks. — The average length of head and body in the live speci- 

 mens is 232 mm., that of tail 231 nun. The tail decidedly exceeds the 

 head and body in only one individual 1 17mm.). In thirteen adull 



