276 ALLEN’S NATURALIST’S LIBRARY. 
of the back lighter; chin greyish-white ; the hind-limbs ex- 
ternally 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. dadbuin. 

Distribution.—East Africa, from the Rovuma river to the Pan- 
gani, 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, Riipp., Neue Wirbelth. Saugeth., p. 5, pl. 2 
(1835); Schl., Mus. Pays Bas, vii., p. to7 (1876). 
Theropithecus gelada, 1s. Geoffr., Arch. Mus., i, p. 576 
(1841). 
Theropithecus senex, Schimp. et Puch., Rev. et Mag. de Zool., 
1857, p- 51- 
Gelada riippellii, Gray, Cat. Monkeys Brit. Mus., p. 33 (1870); 
Garrod, .2: 2:5. 23879; D452. 
Characters.—Male.— Body large and massive; head oblong ; 
face produced, rounded, and nude below the superciliary ridge ; 
nose long and depressed in its middle region, but elevated at 
