DISTRIBUTION.--Nicaragua; San Juan del Norte. {170}IV. AZARA'S DOUROUCOLI. NYCTIPITHECUS AZARÆ. _Simia azaræ_, Humb., Obs. Zool., p. 359 (1811). _Pithecia miriquouina_, Geoffr., Ann. Mus., xix., p. 117 (1812); Kuhl, Beitr., p. 43 (1820). _Nyctipithecus azaræ_, Schl., Mus. Pays Bas, vii., p. 212 (1876). CHARACTERS.--A large rhomboidal black patch between the two large superciliary spots, the two acute angles of which are prolonged, the one under the base of the nose, the other in the median line to the top of the head; the inner side of the limbs, the under side of the body, throat, and chin of a reddish-ochre colour. DISTRIBUTION.--The right bank of the River Paraguay, in the north-east of the Argentine Republic, but not in Paraguay proper. V. THE FELINE DOUROUCOLI. NYCTIPITHECUS FELINUS. _Nyctipithecus felinus_, Spix, Sim. et Vespert. Bras., p. 24, pl. 18 (1823); Is. Geoffr., Cat. Méth. Primates, p. 39 (1851); Gray, Ann. N. H., x., p. 256 (1842). _Nyctipithecus oseryi_, Is. Geoffr. et Deville, C. R., xxvii., 1848, p. 498 (juv.); Geoffr., Cat. Méth. Primates, p. 39 (1851). _Nyctipithecus commersonii_, Gray, Cat. Monkeys Brit. Mus., p. 58 (1870). _Nyctipithecus vociferans_, Schl., Mus. Pays Bas, vii., p. 214 (1876; part). CHARACTERS.--Closely related to the last species, but differs in having the three facial streaks irregular and combining together on the crown, the middle one broad and lozenge-shaped; the frontal spots short, and white. Fur longer and more woolly; neck, chest, under surface of body, inner sides of the limbs, and the base of the tail yellowish; tail round. PLATE XV. [Illustration: THE RED FOOTED NIGHT-MONKEY.] {171}DISTRIBUTION.--This species is rather rare, but it has been obtained at Ega and at Tabatinga on the Upper Amazons; on the Ucayali, and near Yurimaguas on the Huallaga River--in the warm and humid virgin forests--in fact, generally along the Peruvian Amazons.