SCIENTIFIC RESULTS FROM THE MAMMAL SURFEY. 



tjh: 



Tyjpe.—M\x\t male B. M. No. 20-il-l-48 Original number 510 

 Collected, 28 April 1920, by H. W. Wells. Four specimens. 



The three Tura specimens are paler and more drabby than the 

 type, but this appears to be due to their being in more or less faded 

 pelage, as there is a similar area on the hinder back of the type, while 

 the rest of it is in dark fresh fur. 



This species is readily distinguishable from L. ^Jaliari by its paler 

 colour, smaller size, and the peculiar shape of its zygomatic plate. 



It is named in honour of Mrs. Jackson of Tura, to whose kindness 

 and help Mr. Wells owes much of the success which attended his 

 work in the Garo Hills. 



The second species is one externally like Mus homourm, but its 

 skull is clearly that of a Leggada, not a Mus in the narrowest sense. 



Leggada nag arum, sp. n. 



Size and proportions about as in Mus homomus. General colour 

 above grizzled " Dresden brown ", some of the hair-tips black and 

 others dull bufiy drab. Sides clearer drab. Undersurface whitish, 

 more contrasted than is usual in these mice, the hairs slaty basally, 

 whitish terminally ; chin hairs white to their roots. Ears medium, 

 brown. Hands and feet dull white. Tail about as long as head 

 and body, well covered with fine hairs, scale-rings 20 — 22 to the 

 centimeter ; brown above, whitish below. 



Skull lightly built, with long muzzle. Supraorbital edges fairly 

 sharp. Nasals long and narrow. Zygomatic plate fairly broad, 

 convex anteriorly, practically without masseteric knob. Palatal 

 foramina rather long, extending to the first third of m\ Mesop- 

 terygoid fossa narrow, parallel-sided, commencing behind the level 

 of the back of m'. Incisors slender, orthodont, with index 88°— 

 89°, not turned backwards as in L. jacksoni<". 



Dimensions of the type, measured in the flesh : — 



Head and body, 76mm. ; tail 77 ; hindfoot 17-5 ; ear 14. 



Skull, greatest length 21-5; condylo-incisive length 20-6; 

 zygomatic breadth 10.3 ; nasals 8 ; interorbital breadth 4 ; breadth 

 of braincase 10-3 ; zygomatic plate 21 ; palatilar length 10; palatal 

 foramina 4-9 ; upper molar series 4. 



fl'a6.— Upper Assam. Type from Golaghat, 300'. 



Type.— Mult male. B. M. No.. 20-ll-r49 Original number 260. 

 Collected, 12 February 1920, by H. W. Wells. Presented by the 

 Bombay Natural History Society. i i j 



This mouse is readily recognisable by its long muzzle, and skmder 

 orthodont incisors, which differ markedly in set from those of 

 jacksonicB. Besides the type from Golaghat two specmiens from 

 Laitkvnsao, Khasi Hills, and from Cherrapunji may also be assigned 

 to it, as they agree with it in all important characters, though their 

 undersurface is less contrasted with the upper, and their teeth are a 



