1915.] Allen, Review of the South American Sciuride. 278 | 
Specimens examened, 1.— Colombia: Buenavista (alt. 4500 ft.), 1 (Am. 
Mus.). 
Remarks.— A rather weakly differentiated form of igniventris, differing 
from it in having less black in the tail. Known, however, at present from 
only two specimens, the type in the British Museum, from near Bogota, 
and a specimen from Buenavista in the American Museum. 
Urosciurus igniventris cocalis (Thomas). 
Sciurus cocalis THomas, Ann. and Mag. Nat. Hist. (7), VI, p. 138, July, 1900.— 
Oscoop, Field Mus. Nat. Hist., Zodl., X, No. 12, p. 153, April 20, 1914 (Yurimaguas, 
Huallaga River, Peru). 
Type locality.— Mouth of Rio Coco, upper Rio Napo, Ecuador. 
Geographic distribution.— Upper parts of the tributaries of the Rio 
Marafion, from the Rio Coco south at least to the Rio Huallaga. Limits 
of range not known. 
Description.— Similar in size and in general coloration to Urosciurus 
egniventris igniventris, but the light tips of the hairs are greatly reduced in 
extent or quite absent, leaving the black strongly predominant, and the 
underparts are pale yellow instead of red. Head orange on the sides, red 
finely varied with black on the top, continuous with the same color on nape, 
shoulders and flanks (the tipping of the hairs varying in color in different 
specimens from orange to dark chestnut red); back posteriorly nearly or 
wholly black, the black extending also over the basal third of the upper 
surface of the tail; underparts nearly uniform ochraceous buff; fore limbs 
and feet pale orange; hind limbs chestnut, feet orange red; ears red, paler 
at base, with a large postauricular patch of soft orange yellow hairs; tail 
above wholly black at base, the rest at surface orange, the hairs broadly 
zoned with black subbasally, the black zone visible both above and below 
on slight displacement of the hairs at the surface, and gradually narrowing 
on the apical half of the tail. | 
Total length (2 adult females), 569, 559 mm.; head and body, 266, 276; 
tail vertebree, 295, 283; hind foot, c. u., 68, 64. 
Skull (same specimens), total length, 63, 62; zygomatic breadth, 38, 37; 
interorbital breadth, 22.2, — ; postorbital breadth, 20,— ; breadth of 
braincase, 25, 25; nasals, 20 X 9.5, 19 & 9; diastema, 17; maxillary tooth- 
row, 10, 10. 
Specimens examined, 2.— Peru: Yurimaguas, mouth of Rio Huallaga 
(alt. 600 ft.), 2 (Field Mus.). 
Remarl:s.— At present Sciurus cocalis is known fii very few specimens 
and from two localities, mouth of the Rio Coco (type locality), and mouth 
