ORYZOMYS. 243 
a.—peragrus (Oryzomys), Merr., Proc. Wash. Acad. Scien., 1, 
E901; Pp. 263. 
WANDERING RIcE Rat. 
Type locality. Rio Verde, State of San Luis Potosi, Mexico. 
Genl. Char. Similar to O. mexicanus, but grayer and tail longer. 
Color. Above grayer than O. mexicanus, heavily lined with black; 
under parts buffy, deeper than in O. mexicanus; tail bicolor. 
Measurements. Total length, 294; tail vertebrae, 167; hind 
foot, 35. ; 
228. melanotis (Oryzomys), Thomas, Ann. Mag. Nat. Hist., 6th 
Ser., XI, 1893, p. 404. 
BLACK-EARED RIcE Rat. 
Type locality. Mineral San Sebastian, State of Jalisco, Mexico. 
Geogr. Distr. State of Jalisco, Mexico. 
Genl. Char. Size small, slender; tail long, scantily haired. 
Color. Upper parts grizzled rufous, brightest on rump and sides; 
whitish cheek patch between eye and mouth; under parts buffy 
white; ears black; hands and feet white; tail above blackish, beneath 
yellowish white. 
Measurements. Total length, 224; tail, 127; hind foot, 28; ear 
from notch, 18. Skull: basal length, 25.1; zygomatic width, 15.2; 
length of nasals, 12; interorbital constriction, 5.1; width of brain- 
case, 12.8; length of interparietal, 3.4; breadth of interparietal, 10; 
palatal length, 15.5; length of palatine foramen, 5.8; length of upper 
molar series, 4.3. 
229. rostratus (Oryzomys), Merr., Proc. Wash. Acad. Scien., I, 
IQOI,"p. 293. 
BROAD-NOSED Rice Rat. 
Type locality. Metlaltoyuca, State of Puebla, Mexico. 
Geogr. Distr. Eastern Mexico, from State of Puebla to Isthmus 
of Tehuantepec. 
Genl. Char. Similar to O. melanotis; pelage coarse. Skull large, 
long, flat; rostrum long, swollen at base; nasals broad, flat; super- 
ciliary bead moderate. 
Color. Above ochraceous fulvous, lined with black; beneath 
buffy white; tail above dark brown, under side yellowish; ears dark 
brown. 
Measurements. Total length, 277; tail vertebre, 141; hind 
foot, 32.5. 
a.—megadon (Oryzomys), Merr., Proc. Wash. Acad. Scien., 111, 1901, 
Pp. 294. 
