Millci — Six New Mammals from the Malay Archipelago. 27 



Color. — The color does not differ essentially from that of Epimys cre- 

 moriventer, though the oehraceous of the hack is duller (less yellow) and 

 the intermingling of blackish hairs is somewhat more conspicuous. Tail 

 more noticeably blackish than in E. cremoriventer, its annulations coarser 

 and more evident. 



Skull and teeth. — Aside from its conspicuously greater size the skull of 

 Epimys barussanus differs from that of E. cremoriventer in a distinct 

 broadening and deepening of anterior portion of rostrum at once appre- 

 ciable on comparison of specimens. Contrast between width of nasals 

 anteriorly and posteriorly more evident than in the smaller animal. Teeth 

 with no peculiarities of form. 



Measurements. — Type: head and body, 1.73; tail L>4; hind foot, 34 (32). 

 Skull of type: condylobasal length, 36.6 (33.2);* zygomatic breadth, 18.2 

 (16.4); interorbital constriction, 6.6 (6.0)'; breadth of hraincase, 15.4 

 (14.S); depth of hraincase at middle, 11.0 (10.0); nasal, 14.2 (13.2); 

 depth of rostrum behind incisors, S.O (6.8); mandible, 21.8 (20.0); max- 

 illary toothrow, 7.2 (0.0); mandibular toothrow, 7.0 (0.0). 



Specimen* examined. — Four, all from the same locality as the type. 



Epimys mengurus sp. nov. 



Type. — Adult male ( teeth moderately worn ), skin and skull No. 125,021 , 

 r. S. National Museum. Collected at Bukit Menguru, Billiton Island, 

 Sumatra, August 14, 1904, by Dr. W. L. Abbott. Original number, 3581. 



Diagnosis. — Like Epimys cremoriventer but with relatively longer tail, 

 smaller teeth and more slender skull ; nasals showing a tendency to widen 

 anteriorly as in E. barussanus. 



Measurements. — Type: head and body, 134; tail, 182; hind foot, 26 

 (25). Skull of type: condylobasal length, 30.6; zygomatic breadth, 15.0; 

 interorbital constriction, 5.6; breadth of hraincase, 13.4; depth of brain- 

 ease at middle. 9.8; nasal, 12.2; depth of rostrum behind incisors, 7.0; 

 mandible, 17.2; maxillary toothrow, 5.8 ; mandibular toothrow, 5.6. 



Specimens examined. — The type, from Billiton; also two immature indi- 

 viduals from Banka (Nos. 124,887 and 124,889) probably referable to the 

 same form. 



Epimys batus sp. nov. 



'/'///"'• — Adult female (teeth moderately worn), skin and skull No. 

 121,792, U. S. National Museum. Collected on Pulo Pinie, Batu Islands, 

 Sumatra. March 4, 1903, by Dr. W. L. Abbott. Original number, 2368. 



Diagnosis. — A member of the Epimys asper group, with the large size 

 and heavy teeth of E. batamanus Lyon, and E. mandus Lyon, but color 

 very dark and rich, the upperparts essentially as in E. mandus but more 

 strongly oehraceous, the underparts clear yellowish ochraceous-buff with 

 only a slight trace of gray in region of chin. 



Measurements. — Type: head and body, 133; tail, 107; hind foot, 32 

 (30.4). Two adult females: head and body, 135 and 14(i; tail, 105 and 



•Measurements in parenthesis are those of mi old male Ep im ys cremoriventer with 

 much worn teeth (No. 104,154, The Dindings). 



