_Ateles cucullatus_, Gray, P. Z. S., 1865, p. 733; id. Cat. Monkeys Brit. Mus., p. 42 (1870); Murie, P. Z. S., 1865, p. 739; Schl., Mus. Pays Bas, vii., p. 169 (1876). CHARACTERS.--Hairs of body long, but thin on the head, body, limbs and tail; hair of crown very long and projecting over the face and the sides of head, forming what has been called a "hood." Face nude, flesh-coloured; cheeks and lower jaw nearly nude also, but the skin of a blackish hue. Hair on back black, intermingled with numerous others which are yellowish-grey in colour; crown and back of head, hands, and feet black--the hairs black throughout. Nude part of tail flesh-coloured. The hands have a rudiment of a thumb in the shape of a small tubercle. Length of body, 14½ inches; of tail, 27½ inches. DISTRIBUTION.--The Hooded Spider-Monkey is very rare, and very different from any other member of its group in regard to the hair of its head. Its native country is still a matter of uncertainty. Dr. Sclater, however, remarks in the "Proceedings of the Zoological Society" for 1881: "I have some reason to suppose {244}it may be from the northern coast of Colombia, as I am told that a black Spider-Monkey, with long hair over its head, is occasionally brought for sale into Cartagena." X. THE LONG-HAIRED SPIDER-MONKEY. ATELES VELLEROSUS. _Ateles belzebuth_, Geoffr., Ann. Mus., vii., p. 27, pl. xvi. (1806); Gray, Cat. Monkeys Brit. Mus., p. 44 (1870); Schl., Mus. Pays Bas, vii., p. 178 (1876). _Le marimonda_, Humb. Obs. Zool., p. 325 (1811). _Ateles frontatus_ (nec Gray), Sclater, Nat. Hist. Rev., 1861, p. 509. _Ateles vellerosus_, Gray, P. Z. S., 1865, p. 733; Reinh., P. Z. S., 1872, p. 797; Sclater, P. Z. S., 1873, pp. 5, 798, pl. ii.; Alston, in Godman and Salvin, Biol. Centr. Amer. Mamm., p. 10 (1879). _Ateles fuliginosus_ (nec Kuhl), Schl., Mus. Pays Bas, vii., p. 179 (1876). _Ateles pan_, Schl., t. c. p. 180 (1876). CHARACTERS.--Closely allied to _Ateles geoffroyi_. Hair abundant, long, soft, and flaccid. Face flesh-coloured, except for a black bar from the corner of the eye to the cheek; forehead black, its hair short, reflexed, and uniting, so as to form an erect, crest-like ridge, with the fur on the top of the head, which is directed forward. General colour above black to reddish-brown; the head, back, outer side of the entire fore-limb and of the lower part of the hind-limb, hands, and feet, and upper surface of tail deep black; sides of body, loins, and thighs yellowish-brown or dull black washed with rufous; whiskers, throat, whole of under surface of body, inside of fore- and hind-limbs, and under surface of tail (this sometimes black) yellowish-cream colour, but very variable, sharply defined from {245}the dark colour of the upper parts. Thumb entirely wanting. Eyes dark yellowish-grey. May be distinguished from the dark form of Geoffroy's Spider-Monkey by the sharp definition of the colours of the upper and under sides of the body.