No. 1626. MAMMALS FROM HASTERN SUMATRA—LYON. 637 
SCIURUS MELANOPS Milller. 
1899. Sciurus prevostii, JENTINK, Notes Leyden Museum, XI, p. 27. 
1902. Sciurus melanops MILLER, Proc. Acad. Nat. Sci. Philadelphia, March 
1902, p. 151, issued June 11, 1902. 
1905. Sciurus melanops, SCHNEIDER, Zool. Jahrb. Syst., XXIII, p. 109. 
Twenty-four specimens of this species were collected at various 
localities in eastern Sumatra. For measurements and list of locali- 
ties see table, page 639. Sctuwrus melanops was described from speci- 
mens collected along the Indragiri River, Sumatra. Since publishing 
the original description Mr. Miller has had the opportunity of com- 
paring specimens of S. melanops with the cotypes of S. rafilest Vigors 
and Horsfield in the British Museum and made the following notes 
on the two forms: : 
At first sight the two appear to be identical, but rajlesi (cotype No. 84.6.3.8. 
Sumatra Raffles) differs from melanops in considerably smaller size and ap- 
parently in a less blackish cheek. The skin is not in perfect condition, having 
- been mounted and exposed to light. Cheeks very nearly as in Cat. No. 1138153, 
U. S. National Museum (Paratype of S. melanops), but more distinctly grizzled. 
Whitish spots on cheek and muzzle exactly as in Cat. No. 113153. Red of 
underparts essentially as Cat. No. 118153, but distinctly browner and darker, 
especially along median region, outer surface of leg, and on’ shoulder. In 
latter region the palest red is about the same as the darkest at side of wrist 
in melanops. Skull conspicuously smaller and more slender than in melanops; 
ramus of mandible more slender; teeth slightly larger than in melanops, there- 
fore relatively much larger. Measurements of the skull of cotype of S. rafflesi: 
Greatest length, 55 mm. (58.8) ;% basal length, 48.6 (50.4) ; basilar length, 45.6 
(47.4) ; palatal length, 24.8 (28.1); diastema, 138.6 (14.4); zygomatic breadth, 
dl (34.3) ; mastoid breadth, 24 (26); breadth of braincase, 24 (25.4); inter. 
orbital constriction, 28 (22.8); maxillary tooth row, 11.4 (11.2); mandibular 
tooth row, 11.4 (10.9). 
SCIURUS MELANOPS PENIALIUS, new subspecies. 
Type.—Skin and skull of adult female, Cat. No. 144364 U.S.N.M., 
collected on Pulo Penjalei, at the mouth of the Kampar River, eastern 
Sumatra, February 5, 1907, by Dr. W. L. Abbott. Original number 
5040. ! 
Diagnostic characters.—A member of the Sciurus prevostii group 
of squirrels, very similar to Sciurus melanops Miller (see above), dif- 
fering only in the possession of a distinctly darker shoulder, ferrugi- 
nous instead of ochraceous. 
Color, etc.—In all external and cranial characters this subspecies so 
closely resembles Scewrus melanops Miller, aside from its darker 
shoulders, that no detailed description is necessary. 
Measurements.—See table, page 639. 
4 Measurements in parentheses, those of the type of Sciurus melanops Miller. 
