558 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIII 



Thus Cat. No. 142335, U.S.N.M., a nearly mature female, has a much 

 more pointed rostrum than No. 142334, U.S.N.M., an old female. 

 For measurements, see table, page 557. 



NANNOSCIURUS BORNEANUS Lyon. 



1906. Nannosciiiriis borneanus Lyon, Proc. Biol. Soc. Washington, XIX, p. 54, 

 May 1, 1906. 



Thirteen specimens as follows: One skin and skull from Sungei 

 Sama; five skins and skulls and one alcoholic from Tanjong Putus, 

 Landak River; five skins and skulls and one alcoholic from the 

 Kapuas River. (For table of measurements of these and related 

 species, see Lyon, Proc. U. S. Nat. Mus., XXXI, 1906, p. 594.) 



NANNOSCIURUS EXILIS (Miillerj. 



One skin and skull, an adult male, from Sanggau. Collector's 

 measurements: Head and body, 77 mm.; tail vertebrae, 50; liind 

 foot, 25. 



MUS EPHIPPIUM Jentink. 



1880. Mus ephippium Jentink, Notes Leyden Museum, II, p. 15. 



1894. Mus ephippium, Thomas, Ann. Mag. Nat. Hist., 6th ser., XIV, p. 453. 



Nine small rats, most of them immature, from various localities, 

 may be referred to this species. They are somewhat smaller and 

 have darker bellies and narrower audital bulhe than a specimen that 

 seems to be Mus ephippium. from Tarussan Bay, Sumatra, but the 

 material is not sufficient to determine their status satisfactorily. 



For measurements see table below. 



[Caught in Dyak houses. — W. L. Abbott.] 



MUS RAJAH Thomas. 



1894. Mus rajah Thomas, .\^^u. Mag. Nat. Hist., (ith ser., XIV, p. 451. 



One specimen, a young a(Udt male, from the Kapuas River below 

 Tyan. The single specimen is somewhat smaller than specimens of 

 Mus rwjah in the U. vS. National Aluseiun from the Natuna Islands, 

 perhaps owing to its immaturity. 



For measurements, see table below. 



Measurements of Mus from western Borneo. 



Name. 



Mus ephippium.. 



Do 



Do 



Do 



Do 



Mus rajah 



Locality. 



Sungei Sama 



do 



do 



Pulo Jambii 



do 



Kapuas River below 

 Tyan. 



b 142250 

 b 142251 

 * 142252 

 f 142253 

 c 142257 

 142248 



Sex. 



Male.... 

 Female . 



do.. 



do.. 



do.. 



Male 



Age. 



Young adult. 



Adult 



do 



Young adult. 



do 



do 





mm. 

 27.6 

 29.5 

 .30.0 



28.5 



"41.' 7 



^Collector's measurements. 



''Alcoholic. 



c Skin and skull. 



