4 
No. 1626. MAMMALS FROM HASTERN SUMATRA—LYON. 671 
92, 1905, contained a large fetus, at term or nearly so. (Cat. No. 
143550, U.S.N.M., preserved in alcohol.) 
For measurements see table, page 673. 
Iris pale gray brown, ischial callosities, palms of hands, and soles of feet 
black, face slaty black.—W. lL. A. 
PRESBYTIS PERCURA, new species. 
Type.—Skin and skull of adult male, Cat. No. 144088, U.S.N.M., 
collected at Kompei, eastern Sumatra, February 26, 1907, by Dr. W. L. 
Abbott. Original number 5083. 
Diagnostic characters—A member of the Presbytis sumatrana- 
chrysomelas group, differing from typical swmatrana in the absence 
of the conspicuous hght area on the under side of the tail. 
Color.—Type: Upper parts of head and body, outer surfaces of 
arms and legs, feet and hands, and tail, black or blackish. On the 
arms and on the upper parts of the thighs there is a very sheht amount 
of grizzling with whitish. The under side of the tail is grizzled with 
whitish to a greater extent. The bases of the hairs about the forehead 
are heht gray and can be seen without parting them. The belly, 
inner side of thighs, and a narrow stripe on inner side of leg extend- 
ing to heel, inner side of arms from axilla to wrist, chin and a narrow 
Iine on the chest, whitish. Chest and throat, blackish. 
The series of Presbytis percura is very uniform in color, the only 
variation of any note being the amount of blackish suffusion on the 
chest, which 1s more extensive in some individuals than it is in others. 
Some specimens show no grizzling on the arms. 
Skull and teeth—These show no distinguishing characteristics. 
Measurements.—See table, page 673. 
Specimens examined.—Kleven from the Siak region, eastern Su- 
matra. For exact localities, sex, and age, see table, page 673. 
Remarks.—Presbytis percura is evidently closely related to P. 
sumatrana, but 1s readily distinguished by the lack of white on the 
under parts of the tail. No topotypes® of P. swmatrana are at hand 
to make an actual comparison, but the original description and 
figure 8 are so clear as to leave no doubt as to the distinctness of P. 
percura from P. sumatrana. 
“Schlegel, Mus. Hist. Nat. Pays-Bas, VII, Simiae, 1876, pp. 45 and 46. Local- 
ity of specimens in the Leyden Museum is given as Mount Ophir, on the west 
side of Sumatra, near Padang. 
> Miiller and Schlegel, Verhandel, Natuur. Geschied. Nederl. Bezitt. Zool., 
Dawtas Dlx DIS 
