Petinomys lugens 125natural history: Little is known about this species, be-
cause it is rarely detected in surveys. Two important sur-
veys have turned up only two individuals.
general references: Corbet and Hill 1992; Francis and
Duck worth 2008b; Francis and Gumal 2008a; Hayssen 2008a;
Medway 1969; Muul and Liat 1971; J. Payne and Francis 1985;
R. W. Thorington and Darrow 2000; R. W. Thorington and
Heaney 1981; R. W. Thorington, Pitassy, et al. 2002; R. W.
Thor ington, Schennum, et al. 2005; D. E. Wilson et al. 2006.
Petinomys hageni (Jentink, 1888)
Hagen’s Flying Squirrel
description: The hairs on the dorsal surface of the head
and back are slaty, with brown tips. A band of black-tipped
hairs runs from the middle of the nose, around the eyes, to
the ears. The hairs on the gliding membrane are black with
reddish brown tips. The underparts of the squirrel are white
with a reddish tint. The tail is brown.
size: Female—HB 220.0 mm; T 215.3 mm; Mass 345.9 g.
Male—HB 260.8 mm; T 224.0 mm; Mass 358.6 g.
Sex not stated—HB 253.3 mm; T 238.3 mm; Mass 388.0 g.
distribution: Hagen’s fl ying squirrel is reported from
northern Sumatra (Indonesia) and Kalimantan (the Indone-
sian portion of the island of Borneo).
geographic variation: None.conservation: IUCN status—data defi cient. Population
trend—no information.habitat: P. hageni is reported from primary forests, but
nothing else is known regarding this species’ use of ha-
bitat.natural history: Nothing is known about the ecology,
behavior, or general biology of this species.general references: Francis and Gumal 2008b; R. W.
Thorington and Darrow 2000; R. W. Thorington, Pitassy, et
al. 2002.Petinomys lugens (Thomas, 1895)
Siberut Flying Squirreldescription: This large species is uniformly smoky
brownish black. The tail is indistinctly distichous. Each
cheek has a small wart, with three or four bristles on it.size: Female—HB 258.3 mm; T 225.8 mm.
Male—HB 250.0 mm; T 215.0 mm.
Sex not stated—HB 250.0 mm; T 222.5 mm; Mass 433.0 g.