NO. 21 FIFTY-ONE NEW MALAYAN MAMMALS — MILLER 15 



Remarks. — The narrow, elongate form of the skull in this race 

 as compared with the normal outline in the other members of the 

 •group occurring in the Archipelago and on the neighboring mainland 

 is at once appreciable on comparison of series of specimens. 



EPIMYS RATTUS EXSUL, new subspecies 



Type. — Adult male (skin and skull), Xo. 124046, United States 

 National Museum. Collected on James Island, Mergui Archipelago, 

 December 31, 1903, by Dr. W. L. Abbott. Original No. 2958. 



Diagnosis. — Like Epimys rattus dentatus but with auditory bul- 

 lae appreciably reduced in size. 



Measurements. — Type: head and body, 175 mm.; tail, 183; hind 

 foot (dry). 36.5 (34) ; condylobasal length of skull (teeth moder- 

 ately worn), 37.4; zygomatic breadth. 18.5 ; interorbital constriction, 

 6.0; occipital breadth, 14. 7;. depth of braincase, 11. 1; nasal, 14.0; 

 diastema, 10.7; mandible, 23.1; maxillary toothrow (alveoli), 6.9; 

 mandibular toothrow (alveoli), 7.0. 



Specimens examined. — Twelve, from the following islands of the 

 Mergui Archipelago : Sullivan, 1 ; James, 5 ; Loughborough, 6. 



EPIMYS RATTUS FORTUNATUS, new subspecies 



Type. — Adult male (skin and skull), No. 104148, United States 

 National Museum. Collected on Chance Island, Mergui Archipel- 

 ago, December 29, 1899, by Dr. W. L. Abbott. Original Xo. 191. 



Diagnosis. — Size somewhat larger and color more yellowish 

 (ground color a clearer chamois and blackish hairs less abundant) 

 than in the other races of Epimys rattus known to occur in the 

 Mergui Archipelago. Skull normal, with well developed auditory 

 bullae. 



Measurements. — Type: head and body, 205 mm.; tail, 215; hind 

 foot (dry), 38 (36) ; condylobasal length of skull (teeth much worn), 

 41.5; zygomatic breadth, 21.2; interorbital constriction, 6.6; occip- 

 ital breadth, 16.6; depth of braincase, 11.2; nasal, 17.0; diastema, 

 12.9; mandible, 16.3; maxillary toothrow (alveoli), 7.2; mandibular 

 toothrow (alveoli), 6.J. 



Specimens examined. — Three, all from Chance Island. 



EPIMYS BORNEANUS, new species 



Type. — Adult female (skin and skull), No. 196749, United States 

 National Museum. Collected at Telok Karang Tigau, Dutch South- 



