MAMMALS COLLECTED BY DR. W. L. ABBOTT 207 



while in two of M. surifcr it is 57 and 60, in the type of j\[. anatnbce 

 60, and in the t3'pe of AI. pellax 55. Teeth as in Mus surifcr. 



Meas7iretnents. — External measurements of type : total length 387 ; 

 head and body 216; tail vertebrae 171 ; hind foot 42 (40.4) ; ear from 

 meatus 21; ear from crown 16; width of ear 16. Average of five 

 adults: total length 381 (362-400); head and body 215 (203-229); 

 tail vertebrae 169 (159-1S4); hind foot 40.2 (38-43); hind foot 

 without claws 38.7 (37~42)* 



Cranial measurements of type : greatest length 47.5 ; basal length 

 40.4; basilar length 37.5 ; palatal length 21.8; least width of palate 

 between anterior molars 4.4 ; diastema 13.4; length of incisive fora- 

 men 7 ; combined breadth of incisive foramina 4 ; length of nasal 

 19; combined breadth of nasals 5.4; zygomatic breadth 20; in- 

 terorbital breadth 6.8; mastoid breadth 15.4; breadth of braincase 

 over roots of zygomata 17 ; depth of braincase at front of basioccipital 

 1 1.4; frontopalatal depth at posterior extremity of nasals 11; least 

 depth of rostrum immediately behind incisors 8.8 ; maxillary tooth- 

 row (alveoli) 8; width of first upper molar 2.2; mandible 25.4; 

 mandibular toothrow (alveoli) 7.2. 



Specime?zs examined. — Six, all taken on Linga Island, at an alti- 

 tude of about 1000 feet. 



Remarks. — The dull color of the six specimens of j\Ius lingensis 

 is evidently due in part to the abraded condition of the pelage in most 

 of the individuals taken. After due allowance is made for this, how- 

 ever, the differences separating the animal from Mus surifer are still 

 very appreciable. 



MUS STREPITANS sp. nov. 



Type. — Adult female (skin and skull). No. 101697 United States 

 National Museum. From Pulo Siantan, Anambas Island. Collected 

 September 10, 1899. 



Characters, — Similar to Mus vociferansyVxW^x^ from Trong, Lower 

 Siam, but color darker throughout, and ventral surface pale yellow in- 

 stead of dull white. Skull as in the Bornean Mus sabatius. 



Color. — Back and sides ochraceous-buff, duller on back, clearer on 

 sides, everywhere sprinkled with blackish brown. The brown pre- 

 dominates on back and shoulders, gradually giving way on sides to 

 the ochraceous-buff which, however, is nowhere without at least a faint 

 sprinkling of brown. Cheeks and outer side of front legs nearly clear 

 ochraceous-buff. Entire ventral surface and inner side of front legs 



' Proc. Biolog. Soc. Washington, XIII, p. 138, April 21, 1900. 



