28 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vOL. 45 



Tail intermediate between the ochraceous-buff of belly and the 

 rufous of back, the tip black. 



Skull and teeth. — The skull and teeth (pi. ii, fig. 3) exactly re- 

 semble. those of Petatirista nitida (pi. 11, fig. 2) and P. nitidula (pi. 

 II, fig. i), but are intermediate in size, though perhaps most nearly 

 approaching the Javan animal. 



Measurements. — External measurements of type : total length, 

 825 ; head and body, 405 ; tail vertebrae, 420 ; hind foot, 75 (68) ; ear 

 from meatus, 35 ; ear from crown, 24.6 ; width of ear, 16. 



Cranial measurements of type: greatest length, 66.4 {^2) ;^ basal 

 length, 60 (65) ; basilar length, 56 (60) ; length of nasals, 20 (22.4) ; 

 greatest breadth of both nasals together, 11.8 (12.8) ; median palatal 

 length, 32.6 (33.6) ; diastema, 15 (16) ; interorbital breadth, 15.4 

 (16) ; distance between tips of postorbital processes, 36 (36) ; 

 zygomatic breadth, 46.4 (49) ; breadth of braincase above roots of 

 zygomata, 28.6 (28) ; greatest depth of braincase, 22 (23.6) ; occip- 

 ital depth, 17 (17.4) ; mandible, 44 (49.6) ; maxillary toothrow 

 (alveoli), 16 (16) ; mandibular toothrow (alveoli), 16.2 (17). 



Specimens examined. — Eight, all from the Batu Islands. Seven 

 are from Tana Bala, the other from Tana Masa. 



Remarks. — While Petaurista batuana is more like P. nitida in 

 size, its color is much lighter than that of the large Javan animal. 

 It is not quite as light, however, as the small P. nitidula of the 

 Natunas, though in all respects except size it very closely resembles 

 this form. 



MUS STRIDENS sp. nov. 



1900. Mus vociferans Miller, Proc. Wash. Acad. Sci., n, p. 208, August 

 20, 1900. Tioman Island. Not M. vociferans Miller, April 21, 1900. 



Type. — Adult male (skin and skull), No. 104,992, United States 

 National Museum. Collected on Tioman Island, off southeast coast 

 of Malay Peninsula, October 10, 1900, by Dr. W. L. Abbott. Orig- 

 inal number, 702. 



Characters. — Similar to Mus strcpitans of the Anamba Islands, but 

 ears larger and color not as dark. 



Color. — The color so closely resembles that of Mus strcpitans^ 

 that no detailed description is necessary. The ochraceous-buff of 

 back and sides is distinctly paler than in the Anamba animal, and the 

 sprinkling of blackish hairs is less noticeable. Underparts and inner 



^ Measurements in parenthesis are those of an adult male Petaurista 

 nitida from western Java (No. 121,499). 



^ See Proc. Wash. Acad. Sci., 11, pp. 207^08, August 20, 1900. 



