58 Mr. O. Thomas on 



Incisors forming a segment of a large circle, their points 

 thrown strongly forwards. Molars decreasing in size back- 

 wards, the first decidedly larger than the second, its grinding- 

 surface not worn lower than that of the latter. 



Bange. Nepal to Southern Siam, not extending into China. 



Type. Cannomys badius (Rhizomys badius, Hodgs.). 

 Other species castaneus, Blyth, and minor, Gray. 



Descriptions of new species : — 



Kyctocleptes insularis, sp. n. 



General characters as in N. sumatrensis, but size markedly 

 smaller; two adult male skulls measure 75 and 76 mm. in 

 condylo-basal length, and two females 71 mm., while in the 

 Malaccan form these measurements are at least 81 and 78 

 respectively, and often much more. Crests less developed 

 throughout in specimens of corresponding age, and, as a 

 consequence, the occipital plane is distinctly lower. 



Colour very light, though some specimens of the mainland 

 form are similar. Flanks and shoulders whitish ; an ill- 

 defined darker line down crown and nape, and the posterior 

 back darker. One specimen in four with a slight tendency to 

 the reddening of the cheeks often found in sumatrensis, and 

 still more marked in the more northern cinereus. 



External dimensions of a male in spirit : — 



Head and body 320 mm. ; tail 130 ; hind foot 57*5 ; 

 ear 17. 



Skull-dimensions of male and female, the second the type : 

 condylo-basal length 76, 71; condylo-incisive length 77, 

 72'5; zygomatic breadth 56,52; nasals 26*7 x 11, 23 x 11 ; 

 breadth across frontals anteriorly 21*2, 23"5; intertemporal 

 breadth 12, 12*5; height of crown from alveolus of m 3 27*7, 

 27 ; occipital plane, height from basion 25, 24 breadth 33"5, 

 33'5 ; palatal foramina 7, 6*6 ; width of posterior nares 5*4, 6 ; 

 upper molar series (crowns) 14*2, 13'5. 



Ilab. Deli, Sumatra. Type from Padang Brahrang. 



Type. Adult female. B.M. no. 99. 8. 21. 5. Collected 

 and presented by Theo. C. Barclay, Esq. Four specimens 

 examined. 



Whatever Hardwicke's meaning was in attaching the 

 name sumatrensis to an animal which he only knew from a 

 drawing of a Malaccan specimen, it is quite clear that there 

 is no escape from the use of that term for the peninsular 

 form, and now that the Sumatran representative of the genus 

 proves to be different it must have another name. 



The three forms N. cinereus, sumatrensis, and insularis 



