SCIENTIFIC RESULTS FROM THE MAMMAL SURVEY, 27 
Type.—Adult female B. M. No. 20°11:1-56. Original number 431. 
Dollected 10th April 1920 by H. W. Wells and presented by the 
Bombay Natural History Society. One specimen only. 
This rat is externally very like a small R. mackenzier, to which 
species it is probably most closely allied. But it is readily distin- 
guishable by its smaller skull, its large smooth braincase and small 
muzzle. I have much pleasure in naming it after Mr. H. W. Wells, its 
collector, who has already done such good work for the Mammal 
Survey. 
RaTTUS LISTERI GARONUM, subsp. nov. 
Essential characters as in true listeri of Darjiling, but the colour 
much more fulvescent, the upper surface, instead of brown (pale mars 
brown) being light ochraceous-tawny lined with blackish, more as in 
R. edwardsi and other members of this group. 
Dimensions of the type :— 
Head and body 232 mm. ; tail 305 ; hind-foot 46 ; ear 30. 
Skull, greatest length 55; condylo-incisive length 50; zygomatic 
breadth 25 ; nasals 21-5 ; interorbital breadth 8°1 ; breadth of brain- 
case 20°2; interparietal 7x 14:3; palatilar length 23:8; palatal 
foramina 8°9 ; upper molar series 9°7. 
Hab.—Tura, Garo Hills, Assam. Alt. 1,400’. 
Type.—Adult female. B. M. No. 20°11:1-55. Original number 426. 
Collected 26th March 1920 by H. W. Wells. Presented by the Bombay 
Natural History Society. Six specimens. 
Study of the further material now available of this group shows that 
the Darjiling listeri, the present Garo rat, and the Chinese R. edwardst 
are all nearly related inter se, and are together distinguishable from 
the Malay R. vociferans by the greater breadth of the interparietal, 
which is less extended antero-posteriorly, by their more open choane, 
and by their tails being very much more finely scaled, the rings run- 
ning from 9-10 to the centimeter as compared with 7-9 in vociferans. 
In size however the Chinese form, which extends westwards into 
the Kachin region of Burma, markedly exceeds that of Darjilmg and 
Assam, the skull being about 57—58 mm. in total, and 53—54 mm. in 
condylo-incisive length as compared about 54—55 and 50—52 respect- 
ively in R. listeri and its relative of the Garo Hills. R. edwardsi is 
also rather less opisthodont than R. listeri, its index about 63°—65° 
as compared with 53°.55°. 
The difference in colour from true listeri, is well marked in all the 
six Garo specimens, but two of the same group from the Naga Hills 
presented by Mr. J. P. Mills are somewhat intermediate in tone. 
