miller] seventy new MALAYAN MAMMALS 29 



surface of legs pale straw-yellow, not whitish as in AIus vocifcrans, 

 the mainland form. 



Measurements. — External measurements of type : total length, 

 570 (550) ;^ head and body, 254 (229) ; tail vertebrae, 316 (318) ; 

 hind foot, 46 (45.6) ; hind foot without claws, 44 (44) ; ear from 

 meatus, 28 (23) ; ear from crown, 22 (18). 



Specimens examined. — Nine, all from Tioman Island. 



Remarks. — This rat is a well marked form of the sabanns- 

 vociferans group. In most characters it is intermediate between the 

 bright Miis vociferans of Lower Siam and the dull dark M. strepitans 

 of the Anamba Islands, but it appears to differ from both in the large 

 size of the ears. 



MUS MATTHJEUS sp. nov. 



Type. — Adult male (skin and skull). No. 104,159, United States 

 National Museum. Collected on St. Matthew Island, Mergui 

 Archipelago, January 18, 1900, by Dr. W. L. Abbott. Original 

 number, 243. 



Characters. — A large member of the sabanus-vociferans group, 

 differing from Mus vociferans in the duller, more rusty color of the 

 back and sides, and strongly yellowish underparts. Blackish hairs 

 of upperparts not as dark as in the mainland form. 



Color. — The color is essentially as in Mus vocifcrans- except that 

 the ground color of back and sides is tawny instead of ochraceous 

 or tawny-ochraceous, and the dark hairs with which the back is 

 sprinkled are distinctly brownish, while in the related species they 

 are nearly black. Underparts and inner surface of legs cream-buff. 



Measurements. — Measurements of type : total length, 600 ; head 

 and body, 248; tail vertebrae, 350; hind foot, 50 (48) ; ear from 

 meatus, 27; ear from crown, 21; skull, greatest length, 56; zygo- 

 matic breadth, 25. 



Specimens examined. — Twelve (one skull without skin), all from 

 St. A/tatthew Island. 



Remarks. — In its dark, rich color this rat is strikingly different 

 from the other members of the sabanus-vociferans group occurring 

 in the Mergui Archipelago, all of which, so far as known, are paler 

 than the mainland form. 



MUS STRIDULUS sp. nov. 



Type. — Adult female (skin and skull). No. 104,196, United States 

 National Museum. Collected on Bentinck Island, Mergui Archi- 



^ Measurements in parenthesis are those of an adult male Mus strepitans 

 from Pulo Jimaja, Anamba Islands (No. 101,736). 



2 See Proc. Biol. Soc. Washington, xiii, p. 138, April 21, 1900. 



