PEROMYSCUS. 107 



Gcogr. Distr. State of Mexico, range unknown. 



Genl. Char. Size small ; ears large ; similar to P. truii. 



Color. Above pale buffy fulvous and black; side buffy fulvous; 

 under parts white as are also the hands and feet; tail dusky, the 

 sides slightly paler. 



Measurements. Total length, 209 ; tail vertebrae, 114; hind foot, 23. 



( (. gentilis (Peromyscus}, Osgood, Proc. Biol. Soc. Wash., xvn, 



1904, p. 61. 

 FOREIGN MOUSE. 



Type locality. Lagos, State of Jalisco, Mexico. 



Gcnl. Char. Similar to P. gratus, but paler; molars slightly 

 smaller. 



Color. Upper parts pale ochraceous buff and dusky ; sides of head 

 ochraceous buff; under parts white; tail above blackish, beneath 

 white; hands and feet white; ankles dusky. 



Measurements. Total length, 194-210; tail vertebras, 103-120; 

 hind foot, 23-24.5. Skull: greatest length, 27.2; zygomatic width, 

 14; length of nasals, 9.5; interorbital constriction, 4.4; length of 

 upper molar series, 4. 



162. pavidus (Peromyscus] , Elliot, Pub. Field Columb. Mus., in, 



1903, p. 142. Zoology. 

 SHY FIELD MOUSE. 



Type locality. Patzcuaro, State of Michoacan, Mexico. 



Genl. Char. Tail long, ears large, colors dark. Skull with very 

 broad braincase, mastoid width being apparently the greatest; 

 rostrum long and rather slender, its greatest width being less than 

 the least interorbital width, the palatine foramina broad, their 

 posterior ends just reaching the anterior line of the first premolar. 

 Skulls of all the specimens are badly broken. Somewhat similar to 

 P. grains in color, but larger in all its dimensions. 



Color. Upper parts mixed buff and brownish black, palest on 

 hind neck ; orbital ring black ; lateral line from lip to rump ochraceous 

 buff, sides buff; under parts white, tinged with buff on chest; arms 

 buff ; legs and ankles dusky ; hands and feet white ; tail above blackish 

 or brownish black, beneath white; ears brown. 



Measurements. Total length, 238 ; tail vertebrae, 130 ; hind foot, 23. 



163. madrensis (Peromyscus) , Merr., Proc. Biol. Soc. Wash., xn, 



1898, p. 16. 

 MARIA MADRE ISLAND MOUSE. 



Type locality. Maria Madre Island, Tres Marias Islands, State of 

 Jalisco, Mexico. 



