98 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 40. 



EPIMYS EPHIPPIUM Jentink. 



1880. Mus ephippium Jentink, Notes Leyden Museum, vol. 2, p. 15. 

 1894. Mus ephippium, Thomas, Ann. Mag. Nat. Hist., ser. 6, vol. 14, p. 453. 

 1907. Mus ephippium, Lyon, Proc. U. S. Nat. Mus., vol. 33, p. 558, December 24, 

 1907. 

 In addition to the nine specimens of Epimys ephippium taken in 

 western Borneo in 1905, Doctor Abbott secured twelve others, on later 

 expeditions; two from Mount Palung, nine from Sempang River, one 

 from Kendawangan River. None were taken in southeastern Borneo. 

 (For measurements see table below.) 



Measurements of Epimys ephippium. 



i Skull only. 



2 Uterus contained 7 embryos. 



3 Scrotum very large. 



* Mammae 2-2=8, evidently nursing. 



EPIMYS NEGLECTUS Jentink. 



1880. Epimys neglectus Jentink, Notes Leyden Museum, vol. 2, p. 14, January, 

 1880. Type-locality, Banjarmasin. 



Doctor Abbott collected a large number of rats which may be 

 referred to Jentink's Epimys neglectus. Most of them are from small 

 islands lying off the coast of Borneo. Two only are from the main- 

 land of Borneo and none were taken on the comparatively large Pulos 

 Laut and Sebuku. As a whole the 83 specimens are fairly uniform in 

 size, color, and cranial characters, after due allowance has been made 

 for age. The dimensions of head and body, tail, and condylo-basal 

 length of skull are increased as the animal advances toward old age. 

 I have used the amount of wear of the check teeth for comparing ages. 

 The measurements of hind foot and the alveoli of the maxillary tooth 

 row are quite constant, irrespective of age. (See table of measure- 

 ments, p. 101 .) The great majority of the specimens are dark brownish 

 in color but in nearly every island series certain of the skins tend to 

 reddish brown. This is merely an individual characteristic and I am 



