1902.] NATURAL SCIENCES OF PHILADELPHIA. 155 



on lower part of sides, where it gives place to the ochraceous-buff 

 and drab. The general effect is drab, much overl^vid with blackish 

 on back and lightened by the ochraceous-buff on sides, shoulders, 

 neck and flanks. Outer surface of front legs drab, darkening to 

 hair-brown. Outer surface of hind legs similar but distinctly 

 suffu-ed with ocliraceous-buff. Top of head like back, but more 

 finely grizzled, sides of head dull ocnraceous-buff. Muzzle hair- 

 brown. A l)lackish ill-defined eye ring. Under parts whitish 

 cream-buff. Feet the same, but metapodials heavily shaded with 

 hair-bi-owu. Ears and tail dark brown, the latter indLstinctly 

 whitish beneath and throughout distal third. 



Skull and Teeth. — The skull and teeth appear to be essentially 

 similar to those of 3£us vociferans. 



Measurements. — External measurements of type: Total length, 

 558; head and body, 234; tail, 824; hind foot, 47 (44.6). 

 External measurements of an adult female from Liuga Island: 

 Head and body, 234; hind foot, 46 (44). 



Specimens Examined. — Two, one from Sinkep and one from 

 Linga. 



Eemarks. — In coloration 3£us fremens is unlike any of the mem- 

 bers of the group to which it belongs. The general pattern is the 

 same, but the yellowish tints are greatly reduced, both in extent 

 and brightness, while there is a corresponding increase in the drab 

 and black. In 3Ius sirepitans there is as much black on the back, 

 but in this species the yellow tints retain all their brightness, and 

 the drab is scarcely visible. Both specimens of Mus fremens are in 

 fresh, unworn pelage. The Linga skin differs somewhat from the 

 type in the paler color of its head and more yellowish outer surface 

 of the limbs. Whether these differences are due to anvthing more 

 than individual variation it is, of course, impossible to determine 

 without more material. 

 Mus firmus sp. nov. 



Type. — Adult female (skin and skull). No. 113,038 Uni)ed 

 Slates National Museum. Collected on Linga Island, August 25, 

 1901, by Dr. W. L. Abbott. Original number 1,215. 



Characters. — Similar to Mus integer from Sirhas.sen Island, South 

 Natuuas, but size slightly greater and color much less yellow. 

 Mamnue 8. 



Color. — Back and sides a fine grizzle of blackish-brown and 



