274 Bulletin American Museum of Natural History. [Vol. XXXIV, 
of the Rio Huallaga (Osgood). It is less different from zgnientris than 
are a number of the subspecies of the gerrardi group from each other. 
Urosciurus igniventris zamore (Allen). 
Sciurus igniventris zamore ALLEN, Bull. Amer. Mus. Nat. Hist., XX XIII, p. 594, 
Oct. 8, 1914. 
Type locality — Zamora, Ecuador; altitude 2000 feet. 
Geographic distribution.— Known only from the type locality. 
Description.— “Similar to S. zgniventris cocalis but much smaller, with 
the whole under surface of the tail black except a narrow orange red border 
on the apical two thirds, and other color differences. 
“Upperparts blackish, the hairs tipped with chestnut, very minutely 
over the dorsal region, more broadly on the flanks, and with fine puncta- 
tions of yellow on the head; postauricular patches orange; underparts 
nearly uniform pale ochraceous buff, brighter on inside of fore and hind 
limbs and laterally; tail above dull black for the basal third, the hairs 
strongly tipped with chestnut, the rest bright orange, the hairs black 
subbasally for half their length with long orange tips; lower surface of tail 
grizzled red and black for the proximal fourth, the red predominating, 
followed by a broad band of black extending nearly to the tip of the tail and 
narrowly fringed with orange, black thus prevailing from near the base, 
to the tip, with an outer border of orange, the terminal hairs black for half 
their length; fore limbs and feet externally light yellow; hind limbs ex- 
ternally chestnut, the feet pale orange. 
“Total length (in skin), 490 mm.; head and body, 260; tail vertebre, 
230; hind foot, c. u., 61. (The collector’s measurements give the total 
length as 520, which is obviously erroneous, and the tail as 230). 
“Skull, total length, 59; zygomatic breadth, 33.5; interorbital breadth, 
19; postorbital breadth, 20.5; breadth of braincase, 25; nasals, 16.3 X 9; 
maxillary toothrow, 9.2. The type is an old male with much worn teeth. 
Specumens examined, 1, the type. 
Remarks.— “ Sciurus igniventris zamore differs from cocalis, its nearest 
geographical representative, in much smaller size, the total length being 
about 60 mm. less than in cocalis, the total length and zygomatic breadth 
of the skull 3.5 mm. less, and other cranial measurements proportionally 
less. While the general coloration is similar to that of cocalis there are many 
minor differences, aside from the color of the tail, which differs in the pres- 
ence of a much larger amount of black on the under surface. It thus differs 
in coloration from true igniventris as tedifer does, but in the opposite direc- 
