SCIURIDA—SCIURUS VARIABILIS. 771 
collection, also similar, is the first of the four specimens previously referred 
by him to 8S. dangsdorffi. My single specimen from Manaos (mouth of the 
Rio Negro) agrees most nearly with this species. 
The Sciurus tricolor, first described by Tschudi, Wagner here discusses 
at some length, recognizing ic as specifically distinct from the others. De- 
scriptions of two specimens of this species are given from Tschudi, both 
from Northeastern Peru, and of two others collected by Spix, which he had 
previously referred to S. déngsdorffi. One of Tschudi’s specimens has the 
upper surface black, with each hair tipped with light ochre-yellow ; the ven- 
tral surface soiled yellowish-white. The tail is black at the base, mixed 
with hairs ringed with brown or yellow-brown; the rest of the tail with 
the hairs broadly tipped with light fox-red. The other has the dorsal surface 
black, with the hairs broadly ringed with reddish-yellow (mit brettem roth- 
gelben Ringe); the ventral surface, sides of the head, and whole inner sur- 
face of the limbs rust-yellow. As already stated, Wagner refers to this 
species two specimens mentioned in his first account of S. dangsdorffi (the 
second and third). One of them is black above, sprinkled with brownish- 
yellow, passing on the hind limbs into rust-red ; below, grayish-white. The 
other is similar, but the black more predominates over the yellow, and the 
under surface is rusty-brownish, and the tail is also somewhat darker. 
The S. stramineus, described by Kydoux* in 1844, from specimens taken 
in Northern Peru, is scarcely different from the so-called S. igniventris, and 
belongs to the same group. It has essentially the same size, the same large 
ears, and, judged by the description, the same coloration. The Macroxus 
Sumigatus of Gray from the Upper Amazons is evidently based on a mela- 
nistic example, which is probably identical with the melanistic specimens 
from the Rio Negro referred by Wagner to his S. igniventris. 
~ *“TLe corps de cet Eeureuil est couvert de poils assez courts, noirdtres, terminés de jaune paille 
doré. La teinte sur glacis fauve est plus vive aux lombes et 4 la face externe des membres postérieurs. 
La queue a de long poils noirs terminés de jaune-blanchatre, et elle parait comme lavée de cette derniére 
couleur; elle est plutét en panache que distique....... Les joues et le menton sont de couleur 
fauve clair, et la face inférieure des membres, ainsi que le dessous du corps sont également pales. 
“Longener du corps et de téte, 10 pouces (0.27). Longeuer de la queue en comprement ses poiles 
términeaux, 11 pouces (0.30). 
“Cet Ecureuil a été trouvé 4 Omatope au Pérou.”—( Voy. de la Bonite, Zool. i, pp. 38, 39.) 
The plate shows large ears, but the color is quite unlike that given in the description, and better 
agrees with that of the Sciurus nebouxi of Geoffroy than with any of the above-described forms of S. 
variabilis. 
