Their geographical distribution is very wide. They extend over the whole area of the _Cebidæ_, _i.e._, over two of the sub-regions, the Brazilian and Mexican, of the Neotropical Region. I. THE VARIEGATED SPIDER-MONKEY. ATELES VARIEGATUS. _Ateles marginatus_ (nec Geoffr.), Humb. Obs. Zool., pp. 340, 354 (1811). _Ateles variegatus_, Wagner in Schreb., Säugeth., i., p. 313 (1840); id. Abhandl. Akad. Münch., v., p. 420 (1847); Sclater, P. Z. S., 1870, p. 668; 1871, pp. 39, 225; Gray, Ann. Nat. Hist. (4), vi. (1870), p. 472. _Sapajou geoffroyi_ (nec Kuhl), Slack, Proc. Acad. Nat. Sci. Philad., 1862, p. 511 [= [male]]. _Ateles bartletti_, Gray, P. Z. S., 1867, p. 992, pl. xlvii. _Ateles melanochir_, var. Gray, Cat. Monkeys Brit. Mus., p. 43 (1870, in part). _Ateles chuva_, Schl., Mus. Pays Bas, vii., p. 175 (1876). (_Plate XXI._) CHARACTERS.--MALE.--Fur of body abundant, long, and soft; hair of back and top of head long and directed forwards, and projecting over the forehead; beneath and behind the cheeks a band of longish hairs, directed forwards. Top of head, back, front aspect of the entire arms, and of the legs to the knees, hands, feet, and upper side of tail glossy blue-black; a band {232}across the forehead rufous-yellow; the hairs directed upwardly, bordered by a narrower streak of deep black over the eyes; the under side of the fore-limbs, the posterior aspect of the thighs, and the entire leg, the buttocks, and the whole of the under side of the tail as far as the nude portion (which is black), rich orange-yellow; under surface of body paler. Face naked, black, and bordered by a broad white patch of whiskers, reaching from the temple nearly to the angle of the mouth. The black part of the limbs and legs near to the yellow colour, varied with more or fewer yellow hairs. FEMALE AND YOUNG MALE.--Similar to the adult male, but less in size, and the coloration paler than in the adult male. Elbows and feet black; under side of the body greyish-yellow. The white stripe on the sides of the face is wanting in the young female. DISTRIBUTION.--Chyavetas, Nauta, and Elvira in the Peruvian Amazons; Upper Rio Negro, Serra de Cocoi; Upper Cauca river, a southern confluent of the Orinoco; Venezuela. "This species is found on both sides of the Peruvian Amazon (or Marañon), on both shores of the Huallaga, and in the interior forest near the town of Chamicuros. I was told by some of the oldest Indians that these animals are common in the dense forest on the hills near the latter town, their range extending between the Huallaga river and Ucayali river to the head-waters of the Huallaga, between the towns of Lamas and Sarayaçu.... Then again on the Rio Tigri ... and over the head-waters of the Rio Napo, Rio Japurâ and Rio Negro, where Natterer first discovered it." (_Bartlett._)