34 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vol. 45 



larger, darker, and less buffy. Skull with audital bullae actually 

 as well as relatively smaller than in the Simalur rat. 



Color. — Type : upperparts from muzzle to base of tail bluish 

 black, faintly grizzled with dull buff. On sides the black fades to 

 hair-brown, and the dull buff slightly predominates. Outer surface 

 of legs light hair-brown. Underparts and inner surface of legs 

 smoke-gray, somewhat paler than that of Ridgway, Median line of 

 chest with broccoli-brown streak. Feet dull broccoli-brown. Ears 

 and tail blackish. 



Skull and teeth. — The skull resembles that of Mus simalurensis, 

 but is larger and relatively narrower. The audital bullae are actually 

 smaller than in Mus simalurensis and the groove below and in 

 front of meatus is more strongly developed. Teeth as in Mus 

 simalurensis. 



Measurements. — External measurements of type : total length, 

 436; head and body, 226; tail vertebrae, 210; hind foot, 41 (38) ; 

 skull, greatest length, 51.4 (47.4) ;^ basal length, 45.4 (41.8) ;^ 

 zygomatic breadth, 23.4 (23) ;^ interorbital constriction, 7 (7.4) ;^ 

 length of nasals, 20 (18).^ 



Specimens examined. — Eight, all from the Pagi Islands. 



Remarks. — The only species with which this rat needs compari- 

 son is the Mils simalurensis of Simalur Island. It is slightly larger 

 than the Simalur rat, and the underparts lack all trace of buff. The 

 back is also decidedly darker and less distinctly grizzled. 



MUS JULIANUS sp. nov. 



Type. — Adult female (skin and skull). No. 112,393, United States 

 National Museum. Collected on St. Julian Island, South China 

 Sea, June 2, 1901, by Dr. W. L. Abbott. Original number, 987. 



Characters. — A moderate sized, light colored member of the Mus 

 rattus group, resembling Mus siantanicus of the Anamba Islands in 

 general appearance, but readily distinguishable by the large, globular 

 audital bullae, short, deep rostrum, and the massive structure of the 

 anterior zygomatic roots. 



Color. — Upperparts dull yellowish wood-brown, the back darkened 

 by a plentiful sprinkling of blackish and dark hair-brown hairs, the 

 sides lightened by the appearance at surface of ecru-drab under fur. 

 Muzzle and outer surface of legs ecru-drab, the latter faintly washed 

 with wood-brown. Whiskers mixed blackish and whitish. Under- 

 parts and inner surface of legs cream-buff, clouded with ecru-drab 



Type of Mus sinalurensis. 



