210 PEROMYSCUS. 
LARGE-EARED FIELD MOUSE. 
Type locality. Mountains west of Oaxaca City, State of Oaxaca, 
Mexico. 
Geogr. Distr. State of Oaxaca, Mexico; limits of range unknown. 
Genl. Char. Similar to P. megalops; ears and bulle larger. 
Color. Above grayish brown, back blackish; cheeks and sides 
washed with fulvous; under parts whitish; hands and feet whitish; 
wrists and ankles dusky; tail above dusky, beneath whitish. 
Measurements. Total length, 288; tail vertebra, 148; hind foot, 
20; 
185. megalops (Peromyscus), Merr., Proc. Biol. Soc. Wash., x11, 
T8OS, 0p LL Or 
OzoLOTEPEC FIELD MOUSE. 
Type locality. Mountains near Ozolotepec, State of Oaxaca, 
Mexico. 
Geogr. Distr. State of Oaxaca, Mexico; range unknown. 
Genl. Char. Size large; ears short; tail long. 
Color. Above mixed fulvous and black, darkest between ears 
and on dorsal region; cheeks and sides of body salmon fulvous; 
under parts whitish, breast tinged with salmon fulvous; hands 
white; wrists, ankles, and hind feet dusky. 
Measurements. Total length, 282; tail vertebre, 150; hind foot, 
ae 
185a. melanocarpus (Peromyscus), Osgood, Proc. Biol. Soc. Wash., 
XVLl | 19O4,0p4 7s" 
BLACK-FOOTED MOUSE. 
Type locality. Mount Zempoaltepec, State of Oaxaca, Mexico. 
Altitude, 8,000 feet. 
Genl. Char. Similar to P. megalops, but smaller and darker; 
hands blackish to digits. 
Color. Upper parts blackish and mummy brown, darkest on 
middle of back; under parts blackish slate, washed with creamy 
white; pectoral region cinnamon rufous; black line from nostril 
through eye; tail blackish, slightly paler on under side; hands and 
feet dusky brownish to base of toes. 
Measurements. Total length, 241; tail vertebre, 125; hind foot, 
27. Skull: greatest length, 31.6; Hensel, 24.3; zygomatic width, 
rs.2; length of nasals, 12; interorbital constriction, 5.4; length of 
upper molar series, 5. 
185b. altilaneus (Peromyscus), Osgood, Proc. Biol. Soc. Wash., Xv1I, 
1904, p. 74. 
