196 PEROMYSCUS. 
Genl. Char. Body stout; ears very large; tail longer than the body. 
Color. Above mixed glossy brown and pale yellowish brown; 
hands, feet, and lower parts white; white on sides bordered by a line 
of reddish buff, which grades into the color of the upper parts; tail 
above dusky, beneath white. 
Measurements. Total length, 195; tail vertebre, 101; hind foot, 
23; ear, 22. Skull: occipito-nasal length, 29; Hensel, 22; zygomatic 
width, 14; interorbital constriction, 4; length of nasals, 11; palatal 
length, 11; length of upper molar series, 4. 
*qv.—penicillatws (Peromyscus), Mearns, Proc. U. 8. Nat. Mus., 
1896, p. 139. Elliot, Syn. N. Am. Mamm., rgo1, p. 133. 
FRANKLIN Mountains Mouvuse. 
Type locality. Franklin Mountains, near El Paso, El Paso 
County, Texas. 
Geogr. Distr. Texas, probably into State of Chihuahua, Mexico. 
Genl. Char. Nasal bones of skull truncate posteriorly, and 
ending in front of the posterior ends of premaxille. 
Color. Above drab gray tinged with ochraceous buff on rump 
and sides; hands, feet, and under parts pure white; tail dusky drab 
above, white below. 
Measurements. Total length, 202; tail vertebre, 115; hind foot, 
22; ear, 14. 
160a. polius (Peromyscus), Osgood, Proc. Biol. Soc. Wash., xvm, 
1904, p. 61. 
GRIZZLED MOUSE. 
Type locality. Colonia Garcia, State of Chihuahua, Mexico. 
Genl. Char. Similar to P. boylit rowley1, but larger and grayer. 
Color. Upper parts grayish broccoli brown; lateral line pinkish 
buff; orbital ring dusky; under parts white; tail bicolor; hands, feet. 
and ankles white. 
Measurements. Total length, 210-234; tail vertebra, 111-120; 
hind foot, 25-26. Skull: greatest length, 29.9; Hensel, 22.9; zygo- 
matic width, 14.8; interorbital constriction, 4.5; interparietal, 
10.5X2.8; length of nasals, 11.6; palate, 4.4; postpalatal length, 10; 
length of upper molar series, 4.7. 
161. gratus (Peromyscus), Merr., Proc. Biol. Soc. Wash., x, 1898, 
pitas: 
TLALPAM FIELD MOUSE. 
Type locality. Tlalpam, Valley of Mexico. 
* Dr. E. A. Mearns informs me that this mouse has been taken within a mile 
of the Mexican border. 
a 
