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 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.
THE GELADA BABOONS. GENUS THEROPITHECUS.
Theropithecus, Is. Geoffr., Arch. Mus., ii., p. 576 (1841).
This genus has been established for the reception of two species which differ from the true Baboons (Cynocephalus) in having the nostrils placed on the side of the snout, instead of being terminal and opening, Dog-like, on the blunt face of the truncated nose.
I. THE GELADA BABOON. THEROPITHECUS GELADA.
Macacus gelada, Rüpp., Neue Wirbelth. Säugeth., p. 5, pl. 2 (1835); Schl., Mus. Pays Bas, vii., p. 107 (1876).