450 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



Oeogra'phic distribution. — Tana Masa and Tana Bala, Batu Islands. 



Diagnostic characters. — General coloration bright, but less so than in 

 case of the Pinie rat (light markings on hairs ochraceous orange) , 

 light and dark colors of upperparts and sides so arranged as to produce 

 coarse speckling, but dark color somewhat in excess, making animal 

 appear darker than in case of the Pinie form; collar may or may not 

 be present; underparts white. 



Measurements. --&iZQ moderate, head and body, 190 to 225 mm.; 

 tail, 150 to 175; hindfoot 41 to 43; condylobasal length of skull, 40 

 to 44.5; width of braincase, 16.5 to 17.3; maxillary toothrow, 6.5 to 

 7.2. 



Spedmens examined. — Five from Tana Masa and six from Tana 

 Bala. 



RemarJcs. — It is apparently impossible to distinguish between the 

 rajali rats from Pulos Tana Masa and Tana Bala. Of the four skins 

 from Masa two have complete collars, while in the other two it is 

 barely indicated; both of the Bala skuis have well-defined collars 

 rather brighter than in the case of the two Masa specimens. 



RATTUS LINGENSIS PINACUS, new eubspecies. 



Types pecimen.—No. 121846, U.S.N.M., skm and skull of adult 

 female, collected on Pulo Pinie, Batu Islands, March 2, 1903, by Dr. 

 W. L. Abbott; original number 2349. 



Geographic distribution. — Pulo Pinie, Batu Islands. 



Diagnostic characters. — General coloration bright (light markings 

 on hairs ochraceous orange to zinc orange) , hght and dark colors of 

 upperparts and sides so arranged as to produce coarse speckling, dark 

 colors of upperparts less conspicuous and less blackish than in case of 

 Masa and Bala specimens ; underparts white, a collar present in only 

 one out of four specimens at hand. 



Measurements. — Size moderate, tail rather short; head and body, 

 190 to 230 nam.; tail, 140 to 160; hindfoot, 42 to 43; condylobasal 

 length of skull, 40 to 45; width of braincase, 16.5. to 17; maxillary 

 toothrow, 7.2 to 7.5. 



Specimens examined. — Eight from Pinie Island. 



Remxirlcs. — The rats of the rajah group foimd on the three islands, 

 Pinie, Tana Masa, Tana Bala, of the Batu group, are closely related to 

 each other, and practically constitute a form of Rattus lingensis by 

 themselves, separable into two divisions, one on Pmie, and the other 

 confined to the other two islands. 



RATTUS FREMENS MANSALARIS, new subspecies. 



1903. Mus fremens, Milleh, Proc. U. S. Nat. Miis., vol. 26, p. 463, February 3, 

 1903. 



Type-specimen. — No. 114583, U.S.N.M., skin and skuU of adult 

 male, collected on Pulo Mansalar, off west coast of Sumatra, March 

 4, 1902, by Dr. W. L. Abbott; original number, 1591. 



