248 ORYZOMYS. 
Color. Above rufous sparsely lined with black, brightest on the 
rump; head suffused with grayish; under parts yellowish, hairs gray 
at base; tail pale brown above, lighter beneath; hands and feet 
whitish; ears blackish outside, yellowish inside. 
Measurements. Total length, 260; tail, 130; hind foot, 28; ear, 
13. Skull: basal length, 26; basilar length, 24; greatest breadth, 17; 
interorbital constriction, 5.2; breadth across squamosals, 12.9; length 
of nasals, 12.6; palatal length, 14; length of upper molar series, 4.6. 
239. richmondi (Oryzomys), Merr., Proc. Wash. Acad. Scien., 11, 
IgOl, p. 284. 
EsconpIpo RIVER Rice Rat. 
Type locality. Escondido River, 50 miles above Bluefields, Nica- 
ragua. 
Genl. Char. Size large; ear short. Rostrum long, slender. 
Color. Above grizzled yellowish fulvous, lined with black; rump 
sometimes rusty; under parts ochraceous fulvous, palest on chin and 
lips; tail dark, palest beneath. 
Measurements. Total length, 295; tail vertebra, 150; hind foot, 
33-5: 
240. fulvescens (Hesperomys), Sauss., Rev. Mag. Zo6l., 2me Sér., 1860, 
p. Loz. 
Futvous Rice Rat. 
Type locality. ‘‘Mexique.’’ Orizaba, State of Vera Cruz? 
Geogr. Distr. Jalapa and vicinity, State of Vera Cruz, south to 
Yucatan, Mexico, and Guatemala, Central America. 
Genl. Char. Tail longer than head and body; hind feet long, fur 
slightly harsh. 
Color. Above yellowish fulvous, lined with black; flanks fulvous; 
under parts yellowish rufous, except chin and throat, which are 
whitish; tail naked, indistinctly bicolor, grayish above, paler beneath; 
feet pale buff or whitish. 
Measurements. Total length, 173; tail, 100; hind foot, 20; ear, 14. 
A. Oligoryzomys. 
‘Size very small; tail long; hind foot long and slender; fifth hind 
toe moderately long. Skull small, delicate; interorbital region narrow; 
outer edges of frontals squarish, but unbeaded; braincase smooth 
and unridged; zygomatic plate narrow and with but slight forward 
projection; a decided longitudinal depression or trough in middle of 
nasals; molar teeth small and delicate, but essentially like those of 
true Oryzomys; incisor teeth very narrow and delicate.”’ (Bangs.) 
