880 MB. J. LEWIS BONHOTE ON THE [Dec. 4, 



may also be distinguished from that of Mus edwardsi by its smaller 

 size, less prominent supraorbital ridges, and the much smaller 

 auditory bull®, which in this respect agree with those of the 

 sabanus group. 



Teeth similar to those of M. vociferans, but the anterior crescent 

 of the first molar has a deep constriction at its inner side, so that 

 when the tooth is worn it becomes split into a narrow crescent and a 

 round tubercle. 



Dimensions of the type (approx., see below). Head and body 

 290 mm. ; tail 315 ; hind foot 47. 



Skull. Greatest length 57 mm.; basilar length 44; palatal 

 length to henselion 23; length of nasals 21 - 5; breadth of brain- 

 case above zygoma-roots 21 ; interorbital breadth 9. 



Eab. Gunong Inas, Malay Peninsula (4000 ft.). 



Type. Adult 2 , Gunong Inas, 4000 ft., 23rd Dec, 1899. 



I have no hesitation in describing this species as new, although 

 it bears a certain likeness to 3 species, viz. : Mus sabanus Thos., 

 from Borneo ; Mus vociferans Miller jr., from the west side of 

 the Malay Peninsula ; Mus edwardsi Thos., from W. Fokien, 

 China. Prom the first two it may be at once distinguished by 

 the great length of the supraorbital bristle, which in the type 

 measures 71 mm., and in the S specimen 78 mm., as compared with 

 40 mm. in the type of sabanus. The tail is also much shorter, 

 being hardly longer than the body. From Mus edwardsi, which it 

 more closely resembles, it may be at once distinguished by its 

 unicolor tail, darker colour, smaller size, and the impure colour 

 of the underparts. 



For this species I propose the name ciliata, from the long bristles, 

 Avhich form so distinctive a character. Mr. F. F. Laidlaw, who 

 collected these specimens, has brought home examples of both sexes 

 and three skulls, all from the same locality; but owing to the 

 imperfect condition of the skull of the male, I have been obliged 

 to make the female the type. With regard to the measurements 

 which were taken on the spot, there appears to have been some slight 

 oversight. Those given for the <3 , namely, head and body 285 mm., 

 tail 300, hind foot 49, are probably correct ; but I am unable to 

 understand those given for the tvpe, which are " snout to tail 

 12-3 mm., tail 11-4, hind foot 2-9." " The tail of the type is 15 mm. 

 louger than that of the c? , and the hind foot approximately the 

 same size, while the skulls are also practically identical ; but if the 

 measurements of the type, which are presumably taken in inches, 

 be transposed to millimetres, they would not at all fit in either 

 with the measurements of the other specimen, or with the mea- 

 surements of the type taken by myself from the skin aud given in 

 the description. 



44. MUS WHITEHEADI Til OS. 



Mus whiteheadi. Thos. Ann. & Mag. Nat. Hist. ser. 6, xiv. 

 pp. 452 & 457 (1S94). 



a. $ ad. sk. Gunong Inas, about 4000 ft. 



