90 Messrs. H. C. Robinson and C. Boden Kloss on 
Specimens examined.—Three from the type-locality ; one 
from Arbre Broyé, 5400 ft., three from Dalat, 4500 ft., and 
two from Dran, 3000 ft., Langbian Mountains. 
Remarks.—The general colour and pattern of this animal, 
except for the heavy buff mantle, are those of the Javan and 
Continental black-and-tan squirrels ; the yellow back allies 
it specially to the typical bicolor, while in the black tail it is 
like other mainland forms. It emphatically shows that the 
latter are only subspecies of Ratufa bicolor. 
The largest example obtained has a skull length and 
breadth of 79 and 50 mm. respectively. 
(Named after my companion in Annam, Dr. Malcolm 
Smith, C.B.K.) 
For measurements see table on p. 93. 
5. Callosciurus ferrugineus williamsont, subsp. n. 
Above : head and body burnt-sienna to orange-rufous; a 
few black-tipped hairs on the head and ears, but nowhere 
any grizzled areas. Feet like limbs. Base of fur on body 
and limbs blackish. 
Chin and sides of neck ochraceous orange ; remaining 
under parts orange-rufous washed with bay to deep bay 
sharply margined from the colour of the sides, ete. Even 
in the palest-bellied examples the margination can be traced. 
Genital region partly orange-rufous. Tail with proximal 
half bay to chestnut, but the hairs at their bases and the 
whole of the distal part of the tail ochraceous orange. 
Type.—Adult female (skin and skull) obtained at Khet 
Don Heing, northern bank of the Mekong just below Xieng 
Khan on the Paklai loop, on 31st January, 1920, by H. C. 
Robinson and C. Boden Kloss’s collector. No. 7183/S. 
The type is an intermediate example: the extremes 
described above are a male and female, Nos. 7188 and 
7191/S from Ban Na Tung, north bank of the Mekong just 
below Vien Chan (Vien Tian), on 8th February, 1920. 
Specimens examined.—Seventeen from the north bank of 
the Mekong River between Muang Liep, lat. 18° 14’ N., and 
Ban Manao, long. 104°E., a little south of the mouth of the 
Pak Sa tributary. 
6. Callosciurus ferrugineus herberti, subsp. n. 
A good deal of black on the feet and tail; chin, outer 
sides of head, neck, and limbs grizzled olivaceous. 
