FROM KORINCHI, W. SUMATRA. 271 



Palatal foramina long and narrow; interpterygoid space 

 narrow, with almost parallel sides, not wider anteriorly. Bullae 

 moderately dilated (as in the Epimys whiteheadi group). As- 

 cending ramus of mandible very low, coronal process much 

 reduced. 



Bevelled edge of incisors notched and proportions of 

 molars as in Mus, but the structure more nearly as in Epimys, 

 though the transverse laminae are slightly more curved and 

 The anterior cusp of the first lower molar situated more on the 

 inner side of the tooth. Combined length of the second and 

 third upper molars about three-fourths that of the first. 

 Upper incisors scarcely curved, lower very long and slender. 



Type — Oromys crociduroides, sp. nov. 



Orotnys crociduroides, sp. nov. Type : — Adult female 

 (skin and skull), Federated Malay States Museums, No. . 

 571/14, collected on Korinchi Peak, 10,000', AYest Sumatra, 

 on the 8th April 1911, by H. C. Eobinson and C. Boden Kloss. 



Characters: — A small, thickly-furred, dark-coloured rat, 

 belly slightly paler than, and not sharply differentiated from, 

 the sides. Tail longer than head and body. 



Measurements'. — Head and bod} 7 , 103; tail, 133 ; hindfoot, 

 22 mm. (measured in flesh). Skull: greatest length, 27.7; 

 condylo-basilar length, 25.7 ; diastema, 9.8; upper molar row, 

 4.1 ; length of palatal foramina, 5.0 ; median nasal, length 1 1.7 ; 

 breadth of nasals, 2.7 ; zygomatic breadth, 12.9 mm. 



Specimens examined : — Thirty-five. 



Epimys setiger, sp. nov. Type : — Adult female (skin 

 and skull) Federated Malay States Museums, Xo. 626/14, 

 collected at Barong Bham, West side Barisan Eange, Korin- 

 chi, 4,000', West Sumatra, on 11th June 1914, by H. O. 

 Eobinson and C. Boden Kloss. 



Characters: — Like E. ciliata (Bonhote) 4 but with under- 

 pays 'chalk-white instead of ivory-white; tail and feet longer. 

 Skull with shorter nasals, larger teeth and longer palatal fora- 

 mina. 



Measurements : — Head and body, 290; tail, 352; hindfoot, 

 56 mm. (measured in flesh). Skull: greatest length, 60.6; 

 condylo-basilar length, 52.0; diastema, 15.9; upper molar row, 

 11.3; length of palatal foramina, 9.? ; median length of nasals, 

 22.0; breadth of nasals, T.0; zygomatic breadth, 26.8 mm. 



Specimens exa m in ed : — Two. 



4. Mus ciliata, BonhoU, P. Z. S. 1900, p. 879, pi. LVI, 

 R. A. Soc, No. 73, 1916. 



