MAMMALS OF LIBERIA o91 
RODENTIA Gnawing Mammals 
ANOMALURIDAE Scaly-tailed Squirrels 
Anomalurus beecrofti Fraser. Beecroft’s Flying Squirrel 
Anomalurus beecrofti Fraser, Proc. Zool. Soc. London, 1852, p. 17, pl. 32: Fernando Po. 
Size medium, length about 18 inches; above, a mixed black, gray, and yellow, the last pre- 
dominating over the back, giving a greenish tinge; a white mark in the middle of the forehead; 
below, the chin is gray, throat, body, and hind legs washed with orange rufous, the fore legs and 
sides of body and membrane buffy, becoming dusky at the edges. West African forest. 
The sealy-tailed flying squirrels appear to be largely nocturnal and so are 
rarely seen. Of this medium-sized species, Biittikofer and Stampfli secured 
three on the Du River. The former notes that he occasionally heard their 
twittering cry from the tops of the forest trees at night, and for a long time sup- 
posed it was made by lemurs. They are said at times to rest by day clinging 
closely against the trunk of a tree but so much resemble a flake of loose bark as 
easily to escape detection. One of Biittikofer’s specimens was from a fallen 
hollow tree in the forest. 
Anomalurus fraseri derbianus (Gray). Derby’s Flying Squirrel 
Pteromys derbianus Gray, Ann. Nat. Hist., vol. 10, p. 262, 1842: Sierra Leone. 
A larger species, chiefly reddish brown above; head and body 14 inches. 
We did not see this species, but our native hunters assured us that the large 
flying squirrel was occasionally found in the forests. Buttikofer and Stampfli 
obtained it from the region of the Du and the Farmington rivers. Doubtless 
Gray’s name, Pteromys derbianus, based on a large species from Sierra Leone, 
is the representative of frasert in this region. Matschie has also described as 
A. auzembergeri, a large flying squirrel from the middle Cavalla River, on the 
border of the Ivory Coast, which is perhaps the same. 
Anomalurella pusilla batesi (De Winton) 
Anomalurus batesi De Winton, Ann. Mag. Nat. Hist., ser. 6, vol. 20, p. 524, 1897: Como River, 
Gaboon. 
Small, total length about 375 mm., tail 155; above, a warm brownish gray; below, gray on 
the throat, center of body, and lower legs, whitish at the sides; chest washed with pale yellow. 
A single adult female was brought in to us that had been killed by a crew of 
natives at work felling the primeval forest on the Du River Firestone plantations. 
It does not differ so far as can be told from descriptions, from the Gaboon animal 
described by De Winton, and forms a considerable extension of the known range 
of the species, which is now definitely added to the forest fauna of the West 
Coast. 
