PEROMYSCUS. 181 



Gcogr. Distr. State of Oaxaca, Mexico; range unknown. 

 Genl. Char. Size small; similar to Mus miiscnlns. 

 Color. Above drab gray, sides brownish; sides of nose, lips, under 

 parts, hands, and feet white; tail brownish above, white beneath. 

 Measurements. Total length, 187 ; tail vertebrae, 88; hind foot, 2.5. 



136. cozumelte (Peromyscus}, Merr., Proc. Biol. Soc. Wash., xiv, 



1901, p. 103. 

 ISLAND OF COZUMEL MOUSE. 



Type locality. Island of Cozumel, Yucatan, Mexico. 



Genl. Char. Size medium; ears large; similar to P. affinis. 



Color. Above from grayish to fulvous brown; beneath white; 

 tail brownish dusky above, whitish beneath ; wrists and ankles dusky ; 

 hands and feet whitish. 



Measurements. Total length, 180; tail vertebrae, 80; hind foot, 23. 



137. geronimensis (Pcromyscus) , Allen, Bull. Amer. Mus. Nat. Hist., 



1898, p. 156. 

 SAN GERONIMO ISLAND FIELD MOUSE. 



Type locality. San Geronimo Island, Lower California, Mexico. 



Geogr. Distr. Lower California, Mexico; Island form. 



Genl. Char. Similar to P. texensis; size larger. 



Color. Above fulvous brown and black, darker dorsal band per- 

 ceptible; sides pale fulvous; under parts white; tail above dusky, 

 sides beneath whitish. 



Measurements. Total length, 175; tail vertebrae, 83; hind foot, 

 20. Skull: total length, 25; basal length, 21; mastoid breadth, n; 

 interorbital constriction, 3.8; length of nasals, 8. (ex Type.) 



138. dubius (Peromyscus) , Allen, Bull. Amer. Mus. Nat. Hist., 1898, 



P- 157- 

 TODOS SANTOS ISLAND MOUSE. 



Type locality. Todos Santos Island, Lower California, Mexico. 



Geogr. Distr. Lower California, Mexico. 



Genl. Char. Size rather large; color dark. 



Color. Above grayish fulvous brown, and black; sides fulvous; 

 lateral line brownish fulvous; under parts white; hands and feet 

 whitish; tail, basal third blackish brown, sides and beneath whitish. 



Measurements. Total length, 175; tail vertebrae, 82; hind foot, 

 1 8. Skull: total length, 26; basal length, 21.5; zygomatic breadth, 

 12; mastoid breadth, n; interorbital constriction, 3.5; length of 

 nasals, 9.5. (ex Type.) 



It'ueopus sonoriensis (Hesperomys), Le Conte, Proc. Acad. Nat. 

 Scien. Phil., 1853, p. 413. 



