RHITHRODONTOMYS. 203 
Color. Above yellowish brown lined with black, darkest on 
dorsal region and top of head; sides paler and with less black; under 
parts gray; hands and feet white; tail above dark brown, beneath 
whitish. 
Measurements. ‘Total length, 149; tail vertebra, 73; hind foot, 19. 
b.—alticola (Reithrodontomys!), Merr., Proc. Wash. Acad. Scien., 
Mit, 1901, D. S50. 
Mountain Harvest Mouse. 
Type locality. Cerro San Felipe, Oaxaca City, State of Oaxaca, 
Mexico. Altitude, 10,000 feet. 
Genl, Char. ‘Similar to 2. saturatus, but tail somewhat shorter; 
rostrum shorter; bulla larger.”’ 
Color. Above yellowish brown, tinged with rufous and heavily 
lined with black; sides less black; under parts gray; plumbeous of 
under fur showing through; tail above dark brown, beneath whitish; 
hands and feet white; ears brown. 
Measurements. ‘Total length, 153; tail vertebra, 75; hind foot, 19. 
253. peninsula (//ithrodontomys), E\hot, Pub. Field Columb, Mus., 
III, 1903, p. 164. Zodlogy. 
PENINSULAR Harvest Mouse. 
Type locality. San Quentin, Lower California, Mexico. 
Genl. Char. Tail about half the total length; pelage more red 
than that of /. longicaudus, with longer tail and hind feet and 
much larger ears; skull larger, nasals longer, braincase broader, 
interorbital space of nearly equal width throughout, sides nearly 
parallel. 
Color. Above, sides of head, and body, and on thighs reddish 
brown, deepest on thighs and rump and darkest on dorsal region, 
which part is mixed with black; under parts white or grayish white, 
the plumbeous under fur showing; a dark ochraceous spot on sides 
of chest and a paler one on middle of chest between the arms; tail 
dusky brown above, white beneath; hands and feet white, ears dark 
brown, 
Measurements. Total length, 170; tail vertebra, 89; hind foot, 
17.5; ear, 16. Skull: occipito-nasal length, 27; Hensel, 20; zygo- 
matic breadth, 10; interorbital constriction, 3; palatal length, 8.5; 
length of nasals, 13.5. 
254. difficilis (/cithrodontomys!), Merr., Proc. Wash. Acad. Scien., 
III, 1901, p. 550. 
Caprious Harvest Mouse. 
Type locahty. Orizaba, State of Vera Cruz, Mexico. Altitude, 
4,500 feet. 
