No. 1626. MAMMALS FROM EASTERN SUMATRA—LYON. 641 
Diagnostic characters.—Closely related to Sciurus vittatus vittatus 
- (comparison with specimens from the lowlands, east coast of Suma- 
tra) but slightly darker, especially on the underparts, black side 
stripe slightly more conspicuous. 
Color—Type: Upperparts and outer surfaces of legs and upper 
surfaces of feet a fine grizzle of light tawny-olive and black; upper 
surface of tail similar but the grizzle coarser; under surface of tail a 
coarse grizzle of ochraceous and black, the latter color quite conspicu- 
ous at the tip; underparts and inner sides of legs generally a bright 
hazel, or a color between ferruginous and hazel; light side stripe 
(about 80 by 5 mm.) cream-buff; dark side stripe (85 by 10 mm.) 
black. Variations in the series: The series of specimens from Pulos 
Rupat and Padang are on the whole quite uniform, some of the speci- 
mens have the underparts shghtly lighter than they are in the type. 
Only one specimen shows any marked deviation, Cat. No. 1438414, 
U.S.N.M., Pulo Padang, in having the underparts ochraceous. It is 
even brighter beneath than are the skins from Salat Rupat. 
Skull and teeth—Apparently there are no constant cranial and 
dental characters by which Sciurus vittatus rupatius can be distin- 
guished from related forms. 
Measurements.—See table, page 642. 
Specimens examined.—Five from Pulo Rupat and ten from Pulo 
Padang, one from Tebing Tinggi, and two from Pulo Merbau. 
Remarks.—W hile Scturus vittatus rupatius is not a sharply defined 
form, the majority of the specimens average enough darker to consti- 
tute another race. In general dark color, especially in the under- 
parts, this squirrel is somewhat like Sctwrus saturatus Miller, from 
Pulo Mansalar, off the opposite coast of Sumatra, but the light rings 
in the hairs of the upperparts in the latter squirrel are tawny ochra- 
ceous instead of light tawny olive. 
SCIURUS VITTATUS ALBESCENS (Bonhote). 
1901. Sciurus notatus albescens BONHOTE, Aun. Mag. Nat. Hist., 7th ser., VII, 
May, 1901, p. 446. 
1907. Sciurus vittatus albescens, Lyon, Smithsonian Miscell. Coll., XLVIII, 
p. 281, February 4, 1907. 
Two specimens taken at Aru Bay do not differ from certain of the 
skins collected by Doctor Abbott at Loh Sidoh Bay. The latter are 
practically topotypes of S. albescens. The majority of the Loh Sidoh 
Bay skins have many white hairs on the underparts, but two of them 
have comparatively few such hairs, in this respect resembling the two 
skins from Aru Bay. 
For measurements see table, page 642. 
