THE DOUROUCOULIS. mer 
Distribution.—This species is rather rare, but it has been 
obtained at Ega and at Tabatinga on the Upper Amazons ; 
on the Ueayali, and near Yurimaguas on the Huallaga River— 
in the warm and humid virgin forests—in fact, generally along 
the Peruvian Amazons. 
In speaking of his collections made at Ega on the Upper 
Amazons, which he describes as a fine field for a Natural 
History collector, Mr. Bates gives an interesting account of 
the Night-Apes, called “ Ei-a” by the Indians, observed by 
him during his various journeys. “ Of these I found two 
species (Vyctipithecus trivirgatus and NV. felinus) closely re- 
lated to each other, but nevertheless quite distinct, as both 
inhabit the same forests, namely, those of the higher and drier 
lands, without mingling with each other or inter-crossing. They 
sieep all day long in hollow trees, and come forth to prey on 
insects and eat fruits only in the night. One cannot help 
being struck by this curious modification of the American 
type of Monkeys, for the Owl-faced Night-Apes have evidently 
sprung from the same stock as the rest of the Cedzd@, as they 
do not differ much in all essential points from the Whaiapu- 
Sais (Callithrix) and the Sai-miris (Chrysothrix). They have 
nails of the ordinary form on all their fingers, and semi- 
opposable thumbs; but the molar teeth (contrary to what is 
usual in the Cedzd@) are studded with sharp points, showing 
that their nocturnal food is principally insects. 
“T kept a pet animal of ™. ¢vivirgatus for many months, a 
young one having been given to me by an Indian compadre 
as a present from my newly-baptized godson. These Monkeys, 
although sleeping by day, are aroused by the least noise, so 
that, when a person passes by a tree in which a number of 
them are concealed, he is startled by the sudden apparition of 
