_Cynocephalus langheldi_, Matschie, S. B. Ges. Nat. Freunde, Berlin,
1892, p. 233.
CHARACTERS.--Hair of back long and coarse; that of the hinder quarters
shorter. Length of body, 29½ inches; of tail, 18 inches.
General colour, dirty olive-grey--the hairs brown at the base, then
yellowish-grey, ringed further up with black and yellowish-grey and tipped
with black; the long and coarse hair {276}of the back lighter; chin
greyish-white; the hind-limbs externally washed with brownish-yellow; the
upper side of the hands and feet olive-yellow; tail brownish-grey; under
side of body and inside of limbs silvery-grey.
The bright olive-grey of the upper side and the silver-grey under side
distinguish this species from all others; it is most nearly related to _C.
babuin_.
DISTRIBUTION.--East Africa, from the Rovuma river to the Pangani, and
extending to the Victoria Nyanza.