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 vertebrae, 57; ear from 

 crown, 16; hind foot, 22. Skull, 26 x 13.7. (Mearns, 1. c.) 



126. macrotis (Onychomys), Elliot, Pub. Field Columb. Mus., in, 



1903, p. 155. Zoology. 

 LARGE-EARED MOLE MOUSE. 



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. 



Gcnl. 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 vertebras, 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 



