MAMMALS COLLECTED BY DR. W. L. ABBOTT 205 



Underparts and inner surface of legs pale straw-yellow to base of 

 hairs, sharply defined from color of sides and extending to wrists and 

 nearly to ankles. Feet yellowish white, faintly shaded with sepia. 

 Tail and naked ears uniform dark brown throughout. 



Tail as in Mus cre?noriventer. 



Skull. — The skull closely resembles that of Afiis cronoriventer., 

 differing only in slightly larger size and relatively smaller audital bullje, 

 characters that may prove to be purely individual. 



Teeth as in Mus cremorivcnter. 



Measurements. — External measurements of type : total length 304 ; 

 head and body 133; tail vertebrae 171; hind foot 28. 5 (26.5); ear 

 from meatus 16; ear from crown 11. 5; width of ear 14. A second 

 specimen, also a male: total length 285; head and body 133; tail 

 vertebrae 152; hind foot 27 (25).^ 



Cranial measurements of type : greatest length 34 ; basal length 

 29 ; basilar length 26.8 ; palatal length 14.4; least width of palate be- 

 tween anterior molars 3.8; diastema 9.4; length of incisive foramen 

 5.4; combined breadth of incisive foramina 3 ; length of nasals 13.6; 

 combined breadth of nasals 3.8; zygomatic breadth 15.4; interorbital 

 breadth 5.6; mastoid breadth 12.8; breadth of braincase over roots 

 of zygomata 14; depth of braincase at front of basioccipital 10.4; 

 frontopalatal depth at posterior extremity of nasals '].'$>\ least depth 

 of rostrum immediately behind incisors 6.4 ; maxillary toothrow 

 (alveoli) 5.8; width of first upper molar 1.6; mandible 17.4; mandi- 

 bular toothrow (alveoli) 5.6. 



Specimens examined. — Two, from the type locality. 



Re?narks. — Mus Jlaviventer is a yellowish, insular form of M. 

 O'etnoriventei'. It is not closely related to any of the species thus far 

 recorded from the Natuna Islands, unless to the Mus ephippiutJi of 

 Thomas. 



MUS ANAMB^ sp. nov. 



Type. — Adult female (skin and skull) . No. 1 01 737 United States 

 National Museum. From Fulo Jimaja, Anambas Islands. Collected 

 September 21, 1899. 



Characters. — Like Mus surifer Miller^ from Trong, Lower Siam, 

 but with tail always much shorter than head and body. 



Coior. — Upper parts uniform tawny-ochraceous, heavily sprinkled 

 with blackish brown on posterior half of back, less so on shoulders 



^Measurement of hind foot in parenthesis is taken without claws. 

 ''Proc. Biolog. Soc Washington, XIII, p. 148, April 21, 1900. 



