DUIKERS AND SMALL ANTELOPES 533 
The Abbott duiker differs widely from any of the East 
African species by its large size. It resembles quite closely 
in size and color the black duiker of the West Coast of 
Africa, from which it differs by the absence of rufous on 
the chest and the character of the tail, which is long-haired 
throughout. The skull differs from that of the black 
duiker by its narrower mesopterygoid fossa and small 
tympanic bullae. Sclater and Thomas in the “Book of 
Antelopes” suggest that the close agreement which True 
detected between this species and the black duiker is not 
well founded, and that it is really a close relative of the 
red duiker, natalensis. A comparison of skulls, however, 
shows close similarity in the shape of the palate between 
the Abbott and black duiker and less agreement with the 
red species. We are quite justified in considering it the 
East Coast representative of the black duiker of West 
Africa. It belongs in a general way to the group of giant 
duikers, of which the yellow-backed duiker C. sylvicultrix 
is typical. 
The color of the type, which is an adult male, is uniform 
chestnut-brown on the body and legs, the under-parts being 
quite as dark as the flanks. The hinder parts of the back and 
the rump are darkest, and seal-brown in color. The tail is 
dark, like the rump, and has a few white-tipped hairs at the 
tip. The dorsal surface of the head is chestnut, like the body, 
and the crown has a long tuft of blackish hair. The sides of 
head and the snout are light-drab. The ears are chestnut on 
the back with lighter inner surfaces. The type is in the 
National Museum and measures as mounted: head and 
body, 38 inches; tail, 3 inches; hind foot, 11 inches; ear, 
3^2 inches. The skull measures in greatest length 
inches. Horn dimensions: length, 4^ inches; diameter at 
base, 1 yi inches. 
Blue Duikers 
Cephalophus monticola 
The diminutive blue duiker in its numerous geograph¬ 
ical forms is wide-spread throughout Africa from the ex¬ 
treme southern point north through all the forested regions 
to the southern edge of the Sahara on the west and the 
