Lyon — Two New Mammals from Sumatra. 211 



Remarks. — Rattus virtus should also be compared with R. midleri ( Jen- 

 tink).* Mr. Miller's observations on this rat were published by me in 

 1908. t The hairs of the underparts in R. mulleri are described as gray. 

 In R. vlrtvs and its allies the hairs of the underparts are uniformly col- 

 ored, whitish or ivory yellow. In R. mulleri the interpterygoid space is 

 mentioned as extending distinctly further forward than the edge of the 

 last molar, which is not the case in R. virtus and its allies. 



• Notes Leyden Museum, vol. 2, p. 16. 1880. 



t Proc. U. S. Nat. Mus., vol. 34, p. 646. September 14, 1908. Mus bullatus described in 

 that paper is not a member of this group. 



