610 REPORT OF THE HARVARD AFRICAN EXPEDITION 
forests, scurrying to shelter at the least alarm. Of the Yellow-backed Duiker 
there seems to be very little information from Liberia. According to Bittikofer, 
his native hunter, Jackson, told him that it was rare on the Marfa River near the 
Sierra Leone border but more common on the Manna and Solyman rivers. He 
adds that it occurs also on the Junk River, whence Schweitzer secured a speci- 
men that was sent to the Berlin Museum. The British Museum has a specimen 
from Sierra Leone. 
Cephalophus jentinki Thomas. Jentink’s Duiker 
Antilope longiceps Jentink, Notes Leyden Mus., vol. 7, p. 272, pl. 10, 1885, not of Gray. 
Cephalophus jentinki Thomas, Proc. Zool. Soc. London, 1893, p. 417: Liberia. 
Slightly smaller than the preceding, 30 inches high at the shoulder; head, neck, and chest-stripe 
black, a whitish collar on shoulders and chest; body dark gray. Liberia. 
The type of this handsome antelope is a mounted specimen in the British 
Museum, obtained by Biittikofer in Liberia. The species was first described by 
Jentink on the basis of a female secured by the same collector, but unfortunately 
the name was preoccupied for another antelope so that Thomas redescribed it 
under the name given above. Biittikofer and Stampfli secured their specimens 
on the Farmington River and at Schieffelinsville, as the former writes, in an area 
of elevated ground in the triangle between the Junk, Du, and Farmington rivers, 
surrounded by swamps. They are therefore hunted in the rainy season when 
canoes can be put through the swamp at high water. Apparently no other col- 
lectors have taken specimens, and the range is probably very limited. 
Cephalophus dorsalis Gray. Black-backed Duiker 
Cephalophus dorsalis Gray, Ann. Mag. Nat. Hist., ser. 1, vol. 18, p. 165, 1846: Sierra Leone. 
A smaller species, about 16 inches high at the shoulder; general color rufous with a dark dorsal 
stripe which may be clear black or ill defined; a rufous or black crest at the occiput. Gambia and 
Sierra Leone to Gold Coast. 
This is one of the commoner species of duiker in Liberia. We brought back 
specimens from Gbanga that were shot by a native hunter who volunteered his 
services. Biittikofer mentions others from the Junk and Du rivers (Schieffelins- 
ville). At Monrovia one of the white residents had two which he kept as pets 
in his house. They had free run of the house and seemed to make most agreeable 
captives, 
Cephalophus ogilbyi brookei Thomas. Brooke’s Duiker 
Cephalophus brooket Thomas, Ann. Mag. Nat. Hist., ser. 7, vol. 11, p. 290, 1893: Fanti. 
Color bright orange to rufous on hind quarters; nose, nape and neck brown or blackish; a 
narrow black dorsal stripe from withers to tail. Nigeria to Gold Coast, and Liberia. 
Biittikofer and Stampfli secured two specimens on the Du River which are 
included under the name Cephalophus ogilby7 in Jentink’s report on the mammals 
of Liberia. The species is typical in Fernando Po, however, and Thomas has 
named the mainland representative of Fanti C. brooke, which may be regarded 
as of subspecific rank. It has a broader dorsal stripe, and a shorter black tail- 
