168 ALLEN’S NATURALIST’S LIBRARY. 
I. THE THREE-BANDED DOUROUCOLI. NYCTIPITHECUS 
TRIVIRGATUS. 
Aotus trivirgatus, Humboldt, Obs. Zool., p. 306, fig. 28 
(1811). 
NVyctipithecus trivia zatus, 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.—F ur 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. 
Il. THE LEMURINE DOUROUCOLI. NYCTIPITHECUS 
LEMURINUS. 
Nyctipithecus cemurinus, Is. Geoffr., Arch. Mus., iv., p. 24, pl. 
21 (1844) ; Gray, Cat. Monkeys Brit. Mus., p. 58 (1870). 
