THE UAKARI MONKEYS. 177 
along the hind border of the thigh and leg. (W. A. Fortes). 
Between the thigh and the lower part of the leg there is a wide 
expansion of the skin behind the knee. 
The thumb is in the same plane with the other digits and not 
opposable ; digits with compressed and rather elongated nails ; 
the nail of the thumb and the great-toe shorter and more 
“nail”-like ; upper surface of the hands and feet haired, on to 
the fingers. The czecum (6 inches) and intestines (22 inches) 
are absolutely and relatively longer than in any other New 
World Monkey. 
Length of the body, 27-28 inches ; of the tail, 61% 
Distribution—Forests on the north bank of the Amazons, 
opposite Olivenca, not passing eastwards of Ica on the Ica 
river. The exact westward extension of this species still 
remains unknown. ‘The young specimen seen at Fonteboa by 
Bates, and by him referred to this species, was more probably 
B. calvus, as we know from the account given by Geoffroy 
St. Hilaire and Castelnau, that the young of B. rubicundus 
resembles in coloration the adult, and is zo¢ paler. 
Habits.—Gregarious and diurnal; living in the high trees, 
and feeding on fruits, probably exclusively, the length of its 
intestines seeming to indicate that it is more of a vegetarian 
than its allies. 
Ill. THE BALD UAKARI. BRACHYURUS CALVUS. 
Brachyurus calvus, Is. Geoffr., C. R., xxiv., p. 576 (1847); id., 
Arch. Mus., v., p. 560 (1845) ; Castelnau, Expéd. Ameér. 
Sud, Mammif., p. 17, pl. 4, fig. 1 (1855); W. A. Forbes, 
PP. -Z 2. seco, p. 646; Beddard, P. Z. S., 1887, p. 119, 
pl. xii. 
3—V. I. N 
