MAMMALS OF NORTHERN COLOMBIA—HERSHKOVITZ 135 
male in the deciduous forest of the Colonia Agricola de Caracolicito, 
on the southern slope of the Sierra Nevada, and five males, only one 
fully adult, on the high wooded banks of a stream at El Salado, on 
the eastern slope of the same mountain mass. No specimens of 
canicollis were found at these localities. 
P. g. mincae is most nearly related to the northern Venezuelan and 
Guianan races of the species. It differs widely in external characters 
and, especially, in the enamel pattern of the molariform teeth, from 
the forms of guyannensis in Central America and western Colombia. 
From these latter it is completely isolated geographically by the Rio 
Magdalena. It is probable that it has, or had, before wide deforesta- 
tion took place, a continuous range to the north and east, intergrading 
with the pale races of northern Venezuela. At present, so far as 
known, only P. canicollis occupies the Rio Cesar Valley to the east. 
In the Sierra de Perij& the distinctly darker P. guyannensis poliopus 
occurs. 
Specimens examined.—Fourteen, all in the collection of the United 
States National Museum: Minca, 4; Manzanares, between Minca and 
Santa Marta, 2; Bonda, near Santa Marta, 2; Colonia Agricola de 
Caracolicito, Rio Ariguani, 335 meters altitude, 1; El Salado, between 
Pueblo Bello (Pueblo Viejo Sur) and Valencia, 430 meters, 5. 
PROECHIMYS GUYANNENSIS POLIOPUS Osgood 
Echimys chrysaeolus Tuomas, Ann. Mag. Nat. Hist., ser. 7, vol. 1, p. 245, 1898 
(part; specimen from San Cristébal, Tachira, Venezuela, only). 
Proechimys poliopus Oscoop, Publ. Field Mus. Nat. Hist., zool. ser., vol. 10, 
p. 141, 1914. 
Type locality —San Juan de Coldén, altitude 797 meters, on the 
northern slope of the Sierra de Mérida near the angle it forms with 
the Sierra de Perij4, State of Tachira, Venezuela. 
Distribution.—In the Sierra de Mérida and the Sierra de Perijé, 
the Rios Zulia and Catatumbo drainage basins, northeastern Colombia 
and western Venezuela. 
Characters.—Darker throughout than mincae, guairae, and ochra- 
ceus; upperparts Ochraceous-Tawny mixed with black, underparts 
from nearly uniformly white to nearly wholly Drab; fore and hind feet 
Drab with or without white markings. Dental characters as for- 
mulated for mincae. 
Remarks.—The original description was based on a subadult, sex 
unknown. The present series (10 males, 7 females) from Tarra, 
upper Rio Catatumbo, Norte de Santander, Colombia, agrees with 
poliopus in the important characters, though it may prove to average 
darker than comparable adult specimens from the type locality. 
However, the series is near enough geographically to be confidently 
assigned to poliopus. The subspecies as now constituted more nearly 
