_Nyctipithecus trivirgatus_, Gray, Ann. Nat. Hist., x., p. 256 (1842); id., Cat. Monkeys Brit. Mus., p. 58 (1870); Schl., Mus. Pays Bas, vii., p. 213 (1876). CHARACTERS.--Fur short, grey and brown, with a silvery lustre; on the crown of the head three long black linear streaks, distinct from each other; frontal spot whitish; back greyish-brown with a dark dorsal band and a long chestnut patch; chest and lower surface of body rusty-red; throat, and inside of limbs, greyish-ashy; tail long, cylindrical, and with short, blackish-brown hair, more yellow on the under surface of the base. Length of the body, 12 inches; of the tail, 14 inches. DISTRIBUTION.--The type specimen was obtained by Humboldt on the banks of the Cassiquiare, near the head waters of the Rio Negro. Mr. Bates found it at Ega and at other places on the Upper Amazon region. It has been recorded also from Guiana; and from Chanchamayo in Peru, at 3,000 feet above the sea. HABITS.--The habits of the Three-banded Douroucoli are entirely nocturnal. They hide in small troops in a hole in the trunk of a tree from morning till twilight, hunting for food during the night. They have a singularly loud and far-reaching voice for such small animals. II. THE LEMURINE DOUROUCOLI. NYCTIPITHECUS LEMURINUS. _Nyctipithecus lemurinus_, Is. Geoffr., Arch. Mus., iv., p. 24, pl. 21 (1844); Gray, Cat. Monkeys Brit. Mus., p. 58 (1870). {169}_Nyctipithecus felinus_, Gray, List Mamm. Brit. Mus., p. 14 (1843); Schl., Mus. Pays Bas, vii., 214 (1876). CHARACTERS.--Fur of body and head long; tail depressed, broad, with the hair bushy and spreading on the sides as in a Squirrel. Head presenting a dark frontal area with a round white spot over each eye. DISTRIBUTION.--The Lemurine Douroucolis are found in Colombia and in Upper Amazonia; at Macas, on the eastern side of the Andes; and on the upper branches of the main streams of the Amazon, as far as a congenial habitat is met with. III. THE RED-FOOTED DOUROUCOLI.[10] NYCTIPITHECUS RUFIPES. _Nyctipithecus rufipes_, Sclater, P. Z. S., 1872, p. 3, pl. 1. _Nyctipithecus vociferans_, Spix, Sim. et Vespert. Bras., p. 25, pl. 19 (1823; part); Schl., Mus. Pays Bas, vii., p. 214 (1876; part). (_Plate XV._) CHARACTERS.--Above grey, slightly washed on the back with rufous; under side reddish fulvous; three vertical black stripes on the head, similar to _N. trivirgatus_, but much less distinct, narrower, and showing a prominent triangular white patch over each eye; ears large and prominent, almost nude (perhaps the result of captivity). Hands and feet rufous; tail short-haired, cylindrical; the basal half rufous, the remainder reddish-black. Length of the body, 11 inches; and of the tail, 16 inches. The absence of the long chestnut patch on the back distinguishes _N. rufipes_ from _N. trivirgatus_, and its paler colour and the indistinctness of its head-stripes, separate it from _N. felinus_.