232 SIGMODON. 
Genl. Char. Similar to S.h. boruce, tail longer, well haired; 
color paler. 
Color. Above cinnamon brown, dorsal region darker; rump 
shaded with russet; under parts white washed with pale buff; tail 
above dusky, beneath gray; hands and feet yellowish gray; ears gray. 
Measurements. Total length, 260; tail vertebre, 120; hind foot, 
32; ear, 17. Skull: mastoid width, 14.8; length of upper molar series, 
6; length of mandible, 19.2. 
207. fulviventer (Szgmodon), Allen, Bull. Amer. Mus. Nat. Hist., 
1889, p. 180. 
FULVOUS-BELLIED CoTTON Rat. 
Type locality. Zacatecas, State of Zacatecas, Mexico. 
Geogr. Distr. States of Zacatecas and Durango, Mexico. 
Genl. Char. Similar to S. hispidus, but paler, and under parts 
ochraceous buff instead of white. 
Color. Above yellowish brown mixed with black, darkest on 
median line; under parts ochraceous buff; arms and legs buffy; hands 
and feet yellowish gray; tail blackish, mixed with gray. 
Measurements. Total length, 270; tail vertebre, 108; hind foot, 
33. (ex Type.) Skull of type; base broken: total length over inci- 
sors, 35.5; nasals, 13; zygomatic breadth, 21.5; alveolar length of 
upper molar series, 6.3. 
208. melanotis (Szgmodon), Bailey, Proc. Biol. Soc. Wash., xv, 
TO O24 ine 
BLACK-EARED CoTTon Rat. 
Type locality. Patzcuaro, State of Michoacan, Mexico. Alti- 
tude, 7,0004eeb: 
Geogr. Distr. Known from type locality only. 
Color. Above dark ochraceous, lined with black; beneath dark 
rusty ochraceous; hands and feet yellowish brown; tail black, yel- 
lowish beneath at base; ears black. 
Measurements. Type: total length, 275; tail, 100; hind foot, 31. 
Skull: basal length, 31.4; nasals, 12.2; zygomatic breadth, 20.5; 
mastoid breadth, 14.5; alveolar length of upper molar series, 6.3. 
(Bailey 71s 'e2) 
The Rice Rats of the genus Oryzomys are, in a number of the 
species, among the largest of the Muridz, with long, scantily haired 
tails and long hind feet. They are mostly dwellers of tropical regions, 
and in the United States are found only in the coast region of the 
