14 PRIMATES. 
4, NYCTIPITHECUS. 
Aotus, Humboldt, Iliger’s Prod. Syst. Mamm. &c. p. 71 (1811) ; Rec. d’Obs. de Zool. i. p. 358 
(1811)*. 
Nyctipithecus, Spix, Sim. et Vespert. Brasil. p. 24 (1828). 
Nocthora, F. Cuvier, Mammif. i. t. 79 (48° livr., 1824). 
The Douroucoulis, or Night-apes as they have been called, are small Monkeys, re- 
markable for the enormous size of their eyes, the orbits of which, however, are sepa- 
rated by a perfectly ossified and moderately wide septum. Their middle pair of upper 
incisors are larger than the rest, their tails are non-prehensile, their fur close and 
more or less woolly ; and their whole appearance is strikingly like that of some of the 
Lemurs. In habits they are all strictly nocturnal. Four or five species are known, 
ranging from the northern provinces of the Argentine Republic to Nicaragua. Of 
these the only two which come within our limits may be known by the following 
characters :— | 
1. WV. vociferans. Ears very short; fur long and woolly; colour greyish brown ; 
middle frontal spot broad. | 
2. WV. rufipes. Ears larger (naked ?); fur short; colour grey above, shaded with 
red ; lower parts and feet bright rufous; frontal spots narrow and indistinct. 
1. Nyctipithecus vociferans. 
Nyctipithecus vociferans, Spix, Sim. et Vespert. Bras. p. 25, t. xix. (1823, descr. orig.)'; Wagner, 
Abh. bayer. Ak. v. p. 445°; Schlegel, Mus. Pays-Bas, vii. p. 214°. 
Nyctipithecus lemurinus, Is. Geoffroy, Compt. Rend. Ac. Paris, xvi. p. 1151 (1843, descr. orig.)*; 
Arch. du Mus. iv. p. 25, t. i1.°; Sclater, P. Z.S. 1872, p. 3°. 
Mico-dormilon of Colombians. 
Hab. Costa Rica (Van Patten®).—Cotompiat®; Peruvian Amazons 1°. 
The Woolly Douroucouli of Colombia was described by Isidore Geoffroy as a new 
species, but was united with WV. vociferans by Wagner?, after a comparison of Geoffroy’s 
excellent figure and diagnosis with Spix’s type specimens; and his identification has 
been generally accepted. The range of the species would therefore appear to extend 
from the Peruvian Amazons, where it was discovered by Spix near Tabatinga!, through 
Colombia, where it is found near Santa Fé de Bogota and in the forests of Quindit®, 
to Costa Rica, whence a specimen was sent home by Dr. van Patten and identified with 
Geoffroy’s species by Mr. Sclater® It is probably a rare animal in Central America ; 
for it escaped the researches of Drs. Hoffmann and v. Frantzius, and has not yet been 
recorded from Panama or Veragua; and Mr. Salvin thinks that there is even a pos- 
* This title has been almost universally disused in consequence of its contradiction to facts, and may be 
safely rejected under Rule XI. of the Code. 
