236 ORYZOMYS. 
210. albiventer (Oryzomys), Merr., Proc. Wash. Acad. Scien., 111, 
NOOK) oes 7.Or 
WHITE-BELLIED RIcE Rat. 
Type locality. Ameca, State of Jalisco, Mexico. 
Geogr. Distr. State of Jalisco, Mexico; extent of range unknown. 
Genl. Char. Size large; ear short; under parts white; molars large. 
Color. Above ochraceous, lined with black; under parts white; 
tail dusky above, whitish below. 
Measurements. Total length, 295; tail vertebre, 162; hind 
LOOt. 3 7e3" 
211. yucatanensis (Oryzomys), Merr., Proc. Wash. Acad. Scien., 11, 
LQOL pp: Zoe 
CHICHEN Itza RIcE Rat. 
Type locality. Chichen Itza, Yucatan, Mexico. 
Geogr. Distr. Yucatan, Mexico. 
Genl. Char. Similar to O. melanotis, but without white cheek 
patch. Skull: superciliary beads distinct; incisive foramina short; 
molars small. 
Color. Above ochraceous fulvous, extending to and including 
sides of face to nose; head and back lined with black; beneath white; 
tail yellowish beneath, dusky above; ears fulvous brown. 
Measurements. Total length, 235; tail vertebre, 119; hind 
LOOt. 3:2: 
212. peninsula (Oryzomys), Thomas, Ann. Mag. Nat. Hist., 6th Ser., 
MOOT, Ps 540. 
Lower CaALiFrorniA Rice Rat. 
Type locality. Santa Anita, Lower California, Mexico. 
Geogr. Distr. Cape Region, Lower California, Mexico. 
Genl. Char. Size large; fur woolly; tail thinly haired. 
Color. WHead and back anteriorly pale grayish, grading into dull 
fulvous on rump; under parts whitish; hands and feet silvery white; 
tail brown above, whitish below; ear pale brown. 
Measurements. Total length, 298; tail vertebra, 150; hind foot, 
34; ear, 18. Skull: basilar length, 27.3; greatest breadth, 18.7; 
length of nasals, 13; width, 3.9; length of upper molar series, 5; 
length of palatine foramen, 7; width, 3. 
213. couesi (Hesperomys), Alston, Proc. Zoél. Soc., 1876, p. 756. 
couest (Oryzomys), Thomas, Ann. Mag. Nat. Hist., 6th Ser., 1893, 
Pp. 403. 
Couns? Rice Rat. 
Type locality. Coban, Guatemala. 
Geogr. Distr. State of Chiapas into Guatemala, Central America. 
