Feb. 23 BANGS— SANTA MARTA MAMMALS 97 
1900 
Oryzomys (Erioryzomys) monochromos’ sp. nov. 
Type, from Paramo de Macotama, Sierra Nevada de Santa Marta, 11,000 
feet altitude, Colombia, ¢ adult, no. 8348, coll. of E. A. and O. Bangs, 
collected March 7, 1899, by W. W. Brown, Jr. 
General characters.— Similar to O. laniger Thomas of Bogota, but with 
much smaller ears, richer, browner coloring, and whiter feet. 
Color.— Upper parts bistre, more yellowish or raw umber on sides; under 
parts dull yellowish wood-brown. The color of back passes gradually into 
that of sides and the color of sides equally gradually into that of under parts, 
the animal having a decidedly one-colored appearance. Base of hair, every- 
where, slate-color; hands and toes white; feet white, irregularly marked with 
dusky; tail unicolor dusky brown, finely haired; ears small, nearly naked, 
dusky. 
Cranial characters.— Same as those given for the subgenus. 
MEASUREMENTS. 
Total Tail Hind Ear from Ear from 
No. Sex and age length vertebrae foot notch crown (skin) 
8348 & adult 230 110 25 16 13 
8345 Q adult 235 115 24 16 14 
8346 9 adult 240 120 25 16 14 
8347 o adult 235 110 23 16 13 
8248" & youngish 220 106 23 14 fe) 
Skull, type, d adult: basal length, 24.8; occipitonasal length, 29.; length 
of nasals, 11.; interorbital width, 4.8; mastoid width, 12.; upper molar 
series, 4.6; length of palate, to palatal notch, 11.6, to end of pterygoid, 16.4; 
length of single half of mandible, 15.2. 
Remarks.— Mr. Brown took only one specimen of wooly 
orizomys— at San Miguel, 7500 feet altitude — until he visited 
the high Sierra. At Paramo de Macotama he caught four more, 
all at 11,000 feet altitude. Although he set traps constantly 
during his stay at this lofty elevation, and indeed up to 15,000 
feet, the four specimens of O. monochromos were the only mammals 
he took. 
The wooly oryzomys of the high Sierra Nevada de Santa 
Marta is undoubtedly closely related to O. /aniger Thomas of 
Bogota, but has much smaller ears, besides differing in color, that 
animal being described as “above dull olivaceous gray.” ‘The 
1 wovbxpwjuos — one-colored. 
2 No. 8248 is from San Miguel, 7500 feet altitude ; the other four are from Paramo de Maco- 
tama, 11,000 feet. 
