ONYCHOMYS. PEROMYSCUS. 169 
without a well-defined dusky spot; whiskers mostly white or colorless; 
under parts, feet, and end of tail white. 
Measurements. Total length, 157; tail vertebre, 57; ear from 
crown, 16; hind foot, 22. Skull, 2613.7. (Mearns, l. c.) 
126. macrotis (Onychomys), Elliot, Pub. Field Columb. Mus., 111, 
1903, p. 155. Zodlogy. 
LARGE-EARED MoLe MOvusE. 
Type locality. Head of San Antonio River, Lower California, 
Mexico. 
Geogr. Distr. San Quentin to San Antonio River, Trinidad Val- 
ley and plain of El Alamo, to about 5,000 feet elevation in the San 
Pedro Martir Mountains, Lower California, Mexico. 
Genl. Char. Size medium, color pale; ears and hind feet long; 
tail rather long, without white tip; no black spot on ear. 
Color. Above ashy vinaceous finely lined on dorsal surface and 
top of head with blackish brown, causing these parts to be darker 
than the rest of upper surface; sides of body ashy vinaceous; orbital 
ring black; lips, cheeks, under parts, hands, and feet pure white; 
tail dusky above, white beneath; ears pale grayish brown, outer 
edge blackish; tuft of white hairs at base of ears. 
Measurements. Total length, 155; tail vertebre, 55; hind foot, 
21; ear, 20.5; Skull: occipito-nasal length, 26; Hensel, 20; zygo- 
matic breadth, 13.5; interorbital constriction, 4.5; length of nasals, 
7.5; palatal arch to alveoli of incisors, 10; greatest width of brain- 
case, II. 
The next genus, PEROMYSCUS, contains numerous species, and is 
well represented in North America, and for its most characteristic 
member may be selected the White-footed or Deer Mouse, with its 
various races. This little animal with white feet, large ears, subdued 
coloring, bright eyes like shining black beads, and velvet fur is most 
attractive. It has small cheek pouches into which it stores the 
seeds and grain while on its foraging expeditions for providing a food 
supply against the approaching winter; and it is not particular as to 
its choice of abode, often taking up its residence in man’s habitation 
if situated sufficiently convenient to its beloved fields and woods. 
Among the large number of species comprising this genus, there are, 
as may be supposed, those of all sizes and varieties of coloration. 
The most striking perhaps among them all is the Golden Mouse, 
P. nuttalli, of the Central and Southern United States, with its golden 
