184 PEROMYSCUS. 
from nose, under parts of arms, legs, and body pure white; orbital 
ring and line between eyes and nose black; limbs dusky brown; tail 
dusky brown, naked; hands and feet dusky brown; fingers and toes 
whitish; ears naked, dusky. 
Measurements. Total length, 182.4—-187.10; tail, ro8—114.3; hind 
foot, 18.3; ear, 12.7. Skull: basal length, 20.3; total length, 24.6; 
interorbital constriction, 4.3; length of nasals, 9.4; length of upper 
molar series, 4.6; length of mandible, 13.5. 
141. aztecus (Hesperomys), Sauss., Rev. Zodl., 2me Sér., 1860, p. 105. 
Aztec MOUuSsE. 
Type locality. ‘*‘Mexico.”’ 
Geogr. Distr. Cape St. Lucas, Lower California, Sierra de Juan- 
acutlan, State of Jalisco, Mexico. Range unknown. 
Genl. Char. Coloring rich and dark, tail long. 
Color. Upper parts and sides rusty red or rusty orange, extending 
over the arms to the wrists and on the hind leg onto the metatarsus; 
dorsal area brownish black; top of head not so dark as back; sides of 
lips, under parts, hands, and feet white; tail above blackish, beneath 
paler. 
Measurements. Total length, 190; tail vertebre, 107; hind 
00%, Br. 
142. beatz (Peromyscus), Thomas, Ann. Mag. Nat. Hist., 7th Ser., 
XY, 1903, peasy. 
XOMETLA Mouse. 
Type locality. Xometla Camp, Mt. Orizaba, State of Vera Cruz, 
Mexico. Altitude 8,500 feet. 
Genl. Char. Size small; ears large; tail longer than head and 
body, well haired. Skull: supraorbital edges square; interparietal large. 
Color. Upper parts brownish fulvous, grayer on head and fore- 
quarters and lined with black on dorsal surface; sides dull fulvous; 
under surface dull gray, with a buff pectoral spot; hands and feet dull 
white, ankles dusky; tail blackish above, dull white below; ears 
blackish with faint white edges. 
Measurements. Total length, 215; tail, 118; hind foot, 21; ear, 20. 
Skull: greatest length, 28.2; basilar length, 21.6; nasals, 11.5X3.3; 
interorbital constriction, 4.2; interparietal, 3.99.4; palatal length, 
11.5; palatal foramen, 6.8x 2.3; length of upper molar series, 4.5. 
143. fraterculus (Vesperimus), Miller, Amer. Nat., 1892, p. 261. 
fraterculus (Peromyscus), Elliot, Syn. N. Am. Mamm., 1901, p. 136. 
RELATED WHITE-FOOTED MOUSE. 
Type locality. Dulzura, San Diego, California. 
