24 BULLETIN 99, UNITED STATES NATIONAL MUSEUM. 
ERYTHROCEBUS WHITEI Hollister. 
Plate 6. 
1910. Erythrocebus whitei Hotiister, Smiths. Misc. Coll., vol. 56, No. 2, p. 11, 
pl. 2. March 31. (Nzoia River, Guas Ngishu Plateau, British East 
Africa; type in U. 8. National Museum.) 
1910. Erythrocebus formosus Roosrvett, African Game Trails, Amer. ed., p. 474; 
London ed., p. 486. (Specimen from Nimule; not of Elliot.) 
1913. Erythrocebus whitei Evuiot, Rev. Primates, vol. 3, p. 11. June 15. 
Specimens.—Four, as follows: 
Uaanpa: Sixty miles north of Nimule, 1 (T. Roosevelt). 
BritisH East Arrica: Guas Negishu Plateau, 3 (White). 
One of the specimens from British East Africa, the type, was 
killed near the Nzoia River; one was collected 13 miles east of Mount 
Elgon; and one 12 miles east of Sirgoit Rock, all on the Guas Ngishu 
Plateau. The type is the oldest male and is the richest and darkest 
colored of the three, with the most black and gray on the shoulders 
and the brightest rump. A female is next oldest and approaches the 
type closely in the bright coloration of the rump but has much less 
blackish-gray on the shoulders. The other male, adult but somewhat 
younger, has less glossy bay on the rump and back and less well- 
marked shoulders. 
Mr. John Jay White, who, in 1908, collected the type of this species 
and on a later expedition in 1910 secured the other specimens, tells 
me that several small groups of the monkeys were seen on the Guas 
Ngishu Plateau. As usually noted, they were in parties of three or four 
to a dozen animals, traveling on the ground in open country, and were 
very hard to approach. The type-specimen was stalked and shot 
from a low tree. 
Some form of the hussar monkey inhabits the country adinthoaté 
of Nairobi, British East Africa. Heller, in his journal of the Rainey 
Expedition, mentions seeing a group of five, within 100 yards of the 
train, between Kui and Ulu, March 23, 1911. Dr. Einar Lonnberg 
also records the animal near Ulu Station, writing as follows: 
Although I have not myself seen any red monkeys during my expedition to Brit. 
E. Africa, I think it worth mentioning that I heard stated by Dr. Walsh that he had 
shot a red monkey which according to the description must have been a member of 
the patas-group. This happened not far from Ulu station of the Uganda railroad in 
April, 1911. Dr. W. observed it running at a long distance and shot at it believing 
it to be a cheetah, and he confessed to be very astonished to see this strange-looking 
animal when he had killed it. The occurrence of a monkey of this group as far south- 
east as Ulu appears rather interesting, but as I have not seen the specimen I cannot 
tell whether it belongs to any of the species mentioned above. 
Sportsmen and naturalists visiting the vicinity of Ulu should make 
every effort to obtain specimens of the hussar monkey from that 
locality and send them to some museum for determination. The 
| Kungl. Sv. Vet. Akad. Handl., vol. 48, No. 5, p. 38, 1912. 
