276 SMITHSONIAN MISCELLANEOUS COLLECTIONS [voL. 48 
stripe. Basal and terminal sixths of tail, black; the middle four- 
sixths, a coarse grizzle of black and white. 
Skull.—Aside from the somewhat smaller audital bull, skulls 
-of Sciurus proserpine do not differ from skulls of S. borneoensis. 
Measurements.—Type, No. 142285, United States National Mu- 
seum, adult female, and paratype, No. 142284, adult male, respec- 
tively:. Head. and body, 233, 235 mm; tail vertebrae), 230; 245; 
hind foot, with claws, 59, 61; greatest length of skull, 53.7, 53.9; 
basal length, 45.5, 45.8; zygomatic breadth, 34.8, 34; interorbital 
constriction, 22.7, ; breadth of brain-case above roots of 
zygomata, 24.6, 25; mandible, back of condyle to front of symphysis, 
34-4, 34-9. 
Specimens examined.—Two. 
Remarks.—Sciurus proserpine differs from the other members of 
the prevostii group in its general melanistic trend. The lateral stripe 
is not only much reduced, but the underparts are nearly black instead 
of a reddish-brown or chestnut. The grizzled tail and slight 
grizzling about the shoulders show it to be related to the nearby S. 
borneoensis, rather than to the other dark members of the group, S. 
piceus and S. pluto. 
