SCIENTIFIC RESULTS IROM TEE MAMMAL SURVEY. 1067 
SCIENTIFIC RESULTS OF THE MAMMAL SURVEY. 
No. XXXV. 
Two NEW Rodents from the Mergui Archipelago. 
By Oldfield Thomas, F.R.S. 
(^Published hij permission of the Trustees of the British Museum.') 
Among the Mammals collected by Mr. C. Primrose in the Mergui Archi- 
pelago for the Bombay Natural History Society there are examples of the 
two following new species : — 
Petaurista mergulus, sp. n. 
Allied to P. cineraceuSy Bly., but very much smaller. 
Size, as gauged by skull, conspicuously less than in cineraceus. Colours 
essentially as in that animal, or at least as in the non-rufous specimens of 
it, for there is much variation in cineraceus as regard the presence or 
absence of rufous on the head and limbs. Back grizzled greyish brown 
with a slight olivaceus suffusion, the grey tips to the hairs not so conspic- 
uous as in cineraceus. Undersurface greyish white, the hairs whitish with 
their bases more or less grey ; chin and throat browner. Face greyer 
and less olivaceus than back. Eyes with inconspicuous blackish rings. 
Ears not very long, their proectote^short-haired, grizzled brownish white. 
Posterior part of outer surfaces (metectote) with long black hairs, which 
extend back on to the sides of the neck, and form a conspicuous post- 
aural black tuft. Fur on nape and across shoulders often with a rufous or 
fulvous tinge, but there is much variation in this respect. Upper surface 
of parachute washed with olivaceous. Hands and feet black. Tail 
grizzled hoary grey, the extreme tip inconspicuously blackish. 
Skull in general shape as in cineraceus, but much smaller ; the bullae 
also disproportionally smaller. • 
Dimensions of the type, measured in flesh : — 
Head and body 410 mm.; tail 400 ; hindfoot 70 ; ear 37. 
Skull, greatest length 66'7 (in cineraceus 78'7); condylo-incisive length 
62 '2 ; zygomatic breadth 45 ; nasals 20 X 13 5 ; interorbital breadth 
13'6 ; length of bulla 13'2 (in cineraceus 17) ; upper tooth series, 
exclusive of p.^, 14'5. 
Hab. Mergui Archipelago. Type and five others from Ross Island; 
one from Tavoy Island. 
Type. Adult male. B. M. No. 22-8-21-1. Original number 243. Collected 
18 November 1921 by C. Primrose. Presented by the Bombay Natural 
History Society. Seven specimens. 
This Flying Squirrel is clearly most closely allied to the Tenasserim P, 
cineraceus, but it is so much smaller as to demand specific distinction. 
Two of the seven specimens are melanoid in colour, of a glossy blackish 
brown. 
Callosciurus epomophorus tabaudius, subsp. n. 
A dark insular form of the mainland epomophorus, the fore-back tending 
towards rufous. 
Size as usual in the group. Colour essentially as in C. e. davisoni of S. 
Tenasserim, but darker throughout. Epaulets well marked. Nape and 
fore-back strongly suffused with cinnamon, which is not redder towards 
