104 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 40. 



Remarks. — Epimys crassus appears to be a well-defined member of 

 the E. jvrmus group. It is larger than any*other members of the 

 group in the U. S. National Museum. The swelling of the nasals is 

 also quite characteristic. Externally it can not be differentiated 

 from typical jlrmus. 



Measurements of rats of the firmus group. 



1 Collector's measurements 



1 Type. 



EPIMYS SABANUS Thomas. 



1887. Mus sabanus Thomas, Ann. Mag. Nat. Hist,, ser. 5, vol. 20, p. 269, 1887. 



Six specimens from the mainland of Borneo, a fully adult female 

 from the foot of Mount Palling, a young adult female from the 

 Saratok River, and four young adult females from Balik Pap an Bay, 

 and a young adult female from Pulo Laut. The fully adult specimen 

 agrees in all essential respects with an example from northern 

 Borneo. The younger specimens, however, are distinctly smaller, 

 more so than their age would indicate. It is possible that they 

 represent another form of the Epimys sabanus group, but the mate- 

 rial at hand is too scanty to determine this. 



(For measurements see table, p. 106.) 



EPIMYS NASUTUS, new species. 



Type. — Skin and skull of adult male, Cat. No. 145519, collected on 

 Pulo Panebangan, off west coast of Borneo, May 21, 1907, by Dr. W. L. 

 Abbott. Original number, 5270. 



