138 Mammalia of Southern Brazil. 
S. villosus in his memoir on the Mammalia of Southern Brazil. * He 
refers to such variations of color and length of hair, as will embrace 
both species. Should his species not be separable from the S. vil- 
losus, then the S. melanurus and S. nycthemerus, must be also 
united with the latter. 
The entire absence of all brown color from the hair and 
spines of this species, and their replacement by silver white and sul- 
phur yellow, gives it a very distinct appearance. 
35. CCELOGENYS PACA Lmn. 
One skin with skeleton from Sao Joao; one skin with skeleton 
from Chapada, and two skulls without locality. 
36. Dasyprocta azar^e Licht. 
Six skins with skeletons from Chapada; one skin with skeleton 
from Sao Joao; four skins with skulls from Chapada; one skin from 
Chapada without skull; one do, from Sao Joao; two skeletons with- 
out skins from Chapada, and one from Sao Joao; and eight skulls 
without skins from Chapada; total twenty-five individuals. 
The single skins from Sao Joao have the inferior surfaces of a 
deeper yellow than those from Chapada, and the hair of the rump is 
less tinged with gray and more with yellow, than in the latter. 
37. Dasyprocta aurea sp. nov. 
This species is represented by but a single perfect skin in excel- 
lent condition, from Chapada. It is superficially most nearly related 
to the D croconota and D prym7wlopha of Wagler, and represents 
them in Southern Brazil. The species is of about the size of the 
D. azarae and resembles it in general proportions. The ungues 
are, however, shorter, as is also the sole. In color it is peculiar. 
The hairs are uniform orange yellow on all parts of the body, paler 
at the base. There is no crest of long hair on the nape as in D. pry- 
mnolopha, but the hair of the rump is elongate, and rather paler in 
color than on other parts of the body. The top of the head is a 
little darker than the back, having a rufous tinge. The anterior 
faces of the feet are similar to the top of the head. The belly is a 
little paler than the back, but not so pale as the rump. Soles and 
claws yellowish horn color. The ears are rather sparsely haired. 
The tail is very short, as in the D. azarae. 
1 Memoirs of the Akademie der Wissenschaften of Berlin. 1872, p. 56. 
