138 Miller. Seven JVew feats collected in /Siam. 



Hind foot less than 40 mm.; skull less than 45 mm. 



Tail much longer than head and body, dark brown 



throughout Mus cremoriventer. 



Tail about equal to head and body, bicolor. 



Tail slightly shorter than head and body; hind foot 



less than 30 mm.; fur of belly dusky at base Mus asper. 



Tail equal to or slightly longer than head and body; 

 hind foot more than 30 mm.; fur of belly not 

 dusky at base. 



Nasals extending conspicuously behind nasal 

 branches of premaxillaries; white of belly 

 broadly continuous over lower leg with that 



of foot; general color dull ochraceous Mus pettax. 



Nasals not extending behind nasal branches of 

 premaxillaries; white of belly usually sepa 

 rated from that of foot by tawny inner sur 

 face of lower leg; general color bright ochra 

 ceous Mus surifer. 



Mus vociferans sp. nov. 



Type adult male (skin and skull) No. 86,736 United States National 

 Museum, collected in the mountains of Trong, Lower Siam, at about 

 1000 ft. altitude, February 21, 1899. 



Characters. Similar to Mus sabanus Thomas of Borneo, but genera- 

 size slightly greater and color apparently paler and brighter. Antor- 

 bital foramen less constricted below than in M. sabanus and with much 

 wider outer wall. Region about posterior extremity of nasals less ele 

 vated. Molars relatively larger than in Mus sabanus. 



Fur. The fur is composed of three elements: (a) fine, somewhat 

 wooly underfur, plumbeous on the back, white on the belly, (b) coarse 

 terete hairs, and (c) grooved hairs or slender bristles. These all pass by in 

 sensible gradations from one kind to another. On back the hairs and 

 bristles are about 15 mm. in length. Those of rump are not elongated. 

 On belly they are much shorter, scarcely exceeding 6 mm. Inner sur 

 face of legs free from bristles. 



Color. Back and sides ochraceous, everywhere sprinkled with black. 

 The ground color is brightest on back and rump where it approaches 

 orange ochraceous, and dullest on sides where it is very nearly raw 

 sienna. The black is most conspicuous over lumbar region where it is 

 somewhat in excess of the ochraceous. Further forward the two colors 

 are about equally mixed. On sides the black is very inconspicuous. 

 Top of head like back, but colors more finely mingled. Cheeks orange 

 buff, very slightly sprinkled with buff posteriorly. Muz/le dull hair 

 brown. Whiskers black. Belly and inner side of legs dull yellowish 

 white to base of hairs; elsewhere the underfur is slate gray. Feet 

 white, irregularly clouded with hair brown. Tail bicolor at base (dark 

 brown above, whitish below) whitish throughout beyond middle. 



Tail. The long slender tail of Mus vociferans is coarsely, conspicuous- 



