No. 1626. MAMMALS FROM HASTERN SUMATRA—LYON. 635 
resemble topotypes of Petaurista nitedula that no constant differences 
can be found to distinguish them. The greatest length of the skull 
in the Rupat specimens ranges from 62.5 to 65 mm.; in a series of 
seven specimens from the Natunas the extremes are 61.6 to 65.3 mm. 
Ten specimens from the mainland of Sumatra show a range of great- 
est length of skull from 65 to 68.4 mm. 
For measurements of the Rupat specimens see table, page 634. 
RATUFA PALLIATA Miller. 
1889. Sciurus bicolor, JENTINK, Notes Leyden Museum, XI, p. 27. 
1902. Ratufa palliata MiLuER, Proe. Acad. Nat. Sci. Philadelphia, March, 
1902, p. 147, issued June 11, 1902. 
1905. Ratufa bicolor and Ratufa palliata, ScHNEIDER, Zool. Jahrb. Syst., 
XXIII, p. 108. 
1907. Ratufa palliata, Lyon, Proc. U. S. Nat. Mus., XXXII, p. 440, May 
23, 1907. 
Nine specimens from Aru Bay and two from Salat Rupat. No 
Ratufas of this group were taken on Pulo Rupat or other islands, and 
the only specimen taken by Doctor Abbott farther down the coast on 
the east side of Sumatra is the type-specimen, Cat. No. 113162, from 
the Indragiri River. 
For measurements see table, page 636. 
RATUFA ARUSINUS Lyon. 
1905. Ratufa auriventer, SCHNEIDER, Zool. Jahrb. Syst., X XIII, p. 108. 
1907. Ratufa arusinus Lyon, Proc. .U. S. Nat. Mus., XXXII, p. 442, May 28, 
1907. 
Thirteen specimens, skins and skulls from the vicinity of Aru Bay. 
This is a very well-marked form, and no specimens from Sumatra are 
in the National Museum which show evidences of intergrading with 
it, though doubtless future collections will show it to be a subspecies 
of Ratufa hypoleuca from the west coast of Sumatra. 
Tor measurements see table, page 636. 
RATUFA HYPOLEUCA CATEMANA (Lyon). 
1905. Ratufa affinis, SCHNEIDER, Zool. Jahrb. Syst., XXIII, p. 108. 
1907. Ratufa catemana Lyon, Proce. U. 8S. Nat. Mus., XXXII, p. 448, May 23, 
1907. 
Doctor Abbott’s latest collections from eastern Sumatra in the re- 
gion of the Siak River show that this form of Ratufa is more variable 
than was at first supposed. As shown in the original description, 
specimens from the Indragiri River had a tendency to be whitish on 
the underparts instead of tawny as in the type and other specimens 
from the Kateman River. (See table, page 636.) Five of the indi- 
@Proe. U. S. Nat. Mus., XXXII, p. 443. 
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