O88 REPORT OF THE HARVARD AFRICAN EXPEDITION 
is often the first warning the intruder has of their presence. Biittikofer mentions 
their going at times in troops of as many as fifty; yet we never saw such large 
companies but usually ten or a dozen. One little band lived in the high trees 
near our station at Gbanga and might be found almost any day feeding in the 
intermediate heights. By moving very carefully it is often possible to get among 
them, and we secured several specimens. Biittikofer says that he once caught 
one from a canoe that was swimming the Marfa River. 
Cercopithecus nictitans biittikoferi Jentink. Biittikofer’s Guenon 
Cercopithecus bitttikoferi Jentink, Notes Leyden Mus., vol. 8, p. 56, 1886: Liberia. 
Entire upper parts grizzled black and reddish, becoming yellowish at the sides, and gray on 
the limbs; a triangular spot on the nose white; face black, as well as a line from brow to ear and 
another from eye to side of neck, enclosing a white stripe; body and tail white below, inside of fore 
limbs gray. 
At first sight this monkey somewhat resembles the preceding, but the entire 
back instead of only the upper half is speckled, and the tip of the nose has a 
triangular white spot that is conspicuous at a considerable distance. We were 
unable to detect any difference in the habits of the two species. A young one, 
but a few weeks old at most, was brought in to us on the Du, August 16, and a 
slightly older one at Gbanga, September 12. They were uninteresting pets, 
rather stolid and distrustful. It is a common species in the forest area of Liberia. 
Schwarz follows Elliot in regarding Jentink’s Cercopithecus stampflii, described 
from one specimen secured in the Kpwesi country of Liberia, as a synonym of C.n. 
martiniz, but since the type locality of the latter is the island of Fernando Po, 
it is evidently best considered as identical with C. n. biittikofert. 
Bittikofer secured specimens from Bavia, Muhlenburg, Soforé Place, Cape 
Mount, the Junk and the Du rivers; we saw it at various places along our route 
and secured specimens at Gbanga, Betala, Tappi Town, and on the Du. 
Cercopithecus diana diana (Linné). Diana Monkey; ‘Dandy Jack”’ 
Simia diana Linné, Syst. Nat., ed. 10, vol. 1, p. 26, 1758: no locality. 
Above finely speckled black and yellowish, the middle of the back clear chestnut red; legs 
and tail black, with a prominent line of longer buff hairs at the hip; inner side of hind legs bright 
chestnut; throat white, with a small beard, chest and belly black. Sierra Leone and Liberia. 
This handsome monkey is not uncommon in the Liberian forests, but we saw 
rather few, these usually single ones or small companies. Its voice is different 
from that of the Campbell’s Guenon. A female shot July 13 contained a fairly 
large foetus. Biittikofer secured specimens from Bavia, Soforé, Cape Mount, and 
on the Junk and the Du rivers. We more than once saw a single one climb out 
to the ends of branches to gaze at our porters marching along the forest trail, 
but they at once retreated if one stopped to look at them. 
