Another species, the Golden-headed Tamarin (_M. chrysomelas_, of Kuhl), which is in general colour black, with the head, fore-arms, hands, and a line beneath the tail, golden-yellow, is, according to Dr. Gray, "very like a melanism of _Leontopithecus_ (= _Midas_) _rosalia_; but the hands and feet, which are sometimes blackish in that species, are yellow--that is to say, not changed." II. GEOFFROY'S TAMARIN. MIDAS GEOFFROYI. _Midas oedipus_, var. Spix, Sim. et Vespert. Bras., p. 30, pl. 23 (1823). {140}_Hapale geoffroyi_, Pucher., Rev. Zool., 1845, p. 336; Schl., Mus. Pays Bas, vii., p. 258 (1876). _Midas geoffroyi_, Is. Geoffr., Cat. Méth. Primates, p. 63 (1851); Sclater, P. Z. S., 1871, p. 478, pl. xxxviii. _Midas ursulus_ (nec Geoffr.), Rep. Council Zool. Soc., 1858, p. 16. _Oedipus geoffroyi_, Gray, Cat. Monkeys Brit. Mus., p. 65 (1870). (_Plate XIII._) CHARACTERS.--Face black; a patch on the top of the head white; back of neck and shoulders, lower part of back, and upper side of base of tail rusty-brown; ears, back, outer side of arms and thighs, and outer side of upper part of leg, brownish-grey; throat, under surface of body, outer and inner surface of fore-arms and legs, white; remainder of tail black. Hair on the crown of the head short, forming a narrow oblong patch; that on the nape of the neck elongated. DISTRIBUTION.--At present only known from Panama. HABITS.--Unknown. III. THE PINCHÉ MONKEY. MIDAS OEDIPUS. _Simia oedipus_, Linn., Syst. Nat., i., p. 41 (1766); Audeb. Singes, Fam. vi., Sect, ii., pl. iv fig. 2. (1727). _Midas oedipus_, Geoffr., Ann. Mus., xix., p. 122 (1812). _Oedipus titi_, Gray, Cat. Monkeys Brit. Mus., p. 65 (1870). _Hapale oedipus_, Schl., Mus. Pays Bas, vii., p. 258 (1876). CHARACTERS.--Face and sides of head nearly naked; top of head with large, erect, crest; hair of neck elongated; tail not ringed. General colour greyish-brown; outside of limbs and base of tail, washed with rusty-red; crest, throat, and lower surface of body, fore-limbs and front edge of hind-limbs white; extremity of the tail black. PLATE XIII. [Illustration: GEOFFROY'S TAMARIN.] {141}Differs from the preceding species, _M. geoffroyi_, in having a crest. DISTRIBUTION.--The Pinché Monkey is found in the forests of New Granada, near the coast. With the succeeding species we commence the description of the Tamarins which have no conspicuous mane on the back of the neck, and that section whose members have a patch of white hairs around the mouth, each looking at a short distance, as Mr. Bates remarks, "as though it held a ball of snow-white cotton in its teeth." IV. THE WHITE-LIPPED TAMARIN. MIDAS LABIATUS. _Midas labiatus_, Geoffr., Ann. Mus., xix., p. 121 (1812); Gray, Cat. Monkeys Brit. Mus., p. 66 (1870). _Jacchus labiatus_, Desmarest, Mammalog., p. 95 (1820); Humb., Rec. d'Obs. Zool., Prod. sp. 44 (1811).