464 



PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



Many of the skins are in fresh, unworn pelage, a stage in which 

 they differ almost as strongly from the bright-colored Mus surifer of 

 the Malay Peninsula as was the case with the original specimens taken i 

 in midsummer. In fact, the general color of the rats of this group 

 appears to be only slightly affected by abrasion of the fur. In the 

 six specimens from Tapanuli Bay there is no indication of a dark col- 

 lar. The collar is present in about half the skins from the Banjak 

 Islands, though in none is it developed as in the Pulo Mansalar form. 



Measurements of Mas lingensis. 



MUS CATELLIFER, new species. 



Type.— Adult female (skin and skull). Cat. No. 114590, U.S.N.M.I 

 Collected on Pulo Mansalar, off' Tapanuli Baj^, Sumatra, March 3. 

 1902, by Dr. W. L. Abbott. Original number, 1587. 



Characters. — In general similar to Mus lingensis, but darker; lowei 

 leg entirely tawnj^ and throat with broad cross-band of same color. 



I^ur and general external features. — The external characters, coloi 

 excepted, agree so closely with those of Mus lingensis as to need nc 

 special description. The spines on the back are rather less coarse 

 than in the related species. 



