26 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXVIII, 
Type. Old male with worn teeth. B. M. No. 13, 9, 18, 24. Original 
number 3370. Collected 3rd June 1913 by C. A.Crump. Presented 
by the Bombay Natural History Society. Two specimens. 
A far greyer form than any other, evidently a native of a desert 
country. 
A single female mungoose from Hazaribagh is also remarkably 
like the Mt. Abu snimal, and must be provisionally assigned to the 
same subspecies. 
No. XXXI, 
BY 
OLDFIELD Tuomas, F.R.S. 
(Published by permission of the Trustees of the British Museum.) 
TWO NEW RATS FROM ASSAM. 
The late Mr. Wroughton had submitted to me some of the rats 
recently received from Assam for the Survey Collections and I find 
that the two following need description :— 
RATTUS WELLSI, sp. D. 
General size, and skull, smaller than in mackenziei (Journ. Bomb. 
N. H. Soc. xxiv, p. 409, 1916), though the hindfeet are as long as in 
that animal. Colour of the same iron-grey above and white below. 
Ears blackish. Hands white, feet with dark metatarsals and white 
digits. Tail with very fine scaling, about 13 rings going to the centi- 
meter ; rather well covered with hairs ; dark brown above and below 
for four-fifths its length, the terminal fifth white all round. 
Skull peculiarly smooth and rounded, with proportionately large 
braincase, the braincase about as large as in the much larger bowersz. 
Muzzle short and narrow. Interorbital space smooth, with scarcely 
any indication of lateral ridges. Interparietal large, strongly angular 
forwards. Palatal foramina shorter than in mackenzier ; bulle about 
as in that species or a little larger. 
Incisors pale yellowish, fairly orthodont, the index of the single 
example, 79. Molars rather more bulky than in mackenziev. 
Dimensions of the type, measured in the flesh :— 
Head and body 197 mm, tail 220, hindfoot 48, ear 33. 
Skull, greatest length 47°5 ; condylo-incisive length 45°2 ; zygomatic 
breadth 23°6 ; nasals 18°7 As 9 ; interorbital breadth 8 ; ‘breadi of 
braincase 20 ; interparietal 7°2 «8-4 ; palatilar length 22: 5; palatal 
foramina 8°4 ; upper molar series 8-6. 
Hab.—Khasi Hills. Type from Mawphlang ; alt. 5,500’. 
