646 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
MUS BULLATUS, new species. 
Type.—Adult male, skin and skull, Cat. No. 143447, U.S.N.M., col- 
lected on Pulo Rupat, off east coast of Sumatra, March 16, 1906, by 
Dr. W. L. Abbott. Original number 4723. 
Diagnostic characters —Similar to Mus firmus Miller * from Linga 
Island, but lighter in color and with audital bulle about twice as 
large. 
Color.—Upper parts and sides a grizzle of blackish brown and buff, 
the former color in excess on the back and the latter along the sides. 
Under parts cream color, darkened to a bright yellow buff toward the 
sides where it contrasts rather sharply with the blackish brown and 
buff grizzle. 
Fur, etc.—In general the fur is like that of Mus firmus, but coarser 
and many weak grooved bristles are scattered through it. In J. 
firmus these bristles are scarcely more than grooved hairs. In the 
middle portion of the tail there are nine scales to the centimeter. 
Skull and teeth—The skull of Mus bullatus resembles that of J/us 
firmus, but 1t 1s shghtly smaller, and the audital bulle are nearly 
twice as large. The teeth of A/us bullatus are somewhat smaller than 
those of J/. firmus. 
Measurements.—See table, page 649. 
Specimens examined.—Two skins with skulls from Pulo Rupat, 
two skins with skulls and two odd skulls from Pulo Padang, and 
three skins with skulls from the Kateman River. 
Remarks.—Mus bullatus is at once distinguished from J/us firms 
by its large audital bulle, and by its generally somewhat smaller size. 
I can detect no differences between specimens from Pulos Rupat and 
Padang. The three Kateman River specimens give slightly smaller 
external measurements than those from the islands. 
Mus bullatus needs to be compared with Mus miillert Jentink” 
from Batang Singalang, Padang Highlands, western Sumatra. I 
have seen no specimens of this rat, but Mr. Gerrit S. Miller, jr., made 
full notes of the type and another specimen in the Leyden Museum. 
His remarks are here published. 
Mus milleri Jentink. Type: Mounted specimen (immature, sex ?), in fair 
condition. All teeth fully in place except ms, which, however, is almost up but 
absolutely unworn. Skull with back part broken away to frontals. Mandible 
perfect. Fur soft, but rather plentifully sprinkled with long coarse hairs on 
the back. These hairs are not in the least bristly, but with a hand lens most of 
them can be seen to be grooved. They are nowhere conspicuous but are a little 
more numerous on rump than elsewhere. Crown, nape, and back about: hair- 
brown, the underfur gray No. 6, and: the long hairs not far from raw umber, 
the result in certain - lights closely. approaching isabella color.. Sides of body 
and outer surface of legs a dull yellowish brown, between iced: ‘brown and ochra- 
@ Proc. Acad. Nat. Sci. Philadelphia, March, 1902 ,.D.-155, issued June 11, 1902. 
Notes Leyden Museum, II, 1880, p. 16. 
