RHITHRODONTOMYS. 267 



Genl. Char. Size small; ears large; tail short; nasals equal to 

 premaxillae. 



Color. Above buffy fulvous to golden fulvous, lined with black; 

 beneath buffy salmon; tail dusky above, whitish below; hands whitish, 

 feet brownish, whitish towards toes; wrists and ankles dark, nearly 

 black; ears blackish. 



Measurements. Total length, 165; tail vertebrae, 90; hind foot, 20. 



a. nerterus (Rcithrodontomys!), Merr., Proc. Wash. Acad. Scien., 



in, 1901, p. 551. 

 COLIMA HARVEST MOUSE. 



Type locality. Sierra Nevada de Colima, State of Jalisco, Mexico. 

 Altitude, 6,500 feet. 



Genl. Char. Similar to K. colimce; tail longer, skull and molars 

 smaller. 



Color. Above golden fulvous, lined with black, darkest on doisal 

 line; side golden fulvous; under parts salmon buff; hands and feet 

 brown; tail above blackish brown, paler beneath; ears dark brown. 



Measurements. Total length, 190; tail vertebrae, no; hind 

 foot, 20. 



261. costaricensis (Rcithrodontomys!), Allen, Bull. Am. Mus. Nat. 



Hist., 1895, p. 139. 

 COSTA RICA HARVEST MOUSE. 



Type locality. La Carpintera, Costa Rica. Altitude, 6,000 feet. 



Geogr. Distr. Costa Rica, Central America. 



Genl. Char. Size large; similar in color to Pcromyscus cherrii. 



Color. Upper parts ferrugineous brown, lined with black; sides 

 orange rufous; under parts white, washed with yellow; fulvous patch 

 sometimes on breast; tail nearly naked, dusky brown, unicolor; 

 hands and feet whitish, with a median dusky stripe on feet; ears 

 brown. 



Measurements. Total length, 197; tail vertebrae, in; hind foot, 

 20.5; ear, 12. Skull: occipito-nasal length, 22.5; Hensel, 17; zygo- 

 matic width, 12; interorbital constriction, 3.5; length of nasals, 8; 

 palatal length to incisive foramina, 4; length of upper molar series, 3. 



a. jalapcK (Reithrodontomys!), Merr., Proc. Wash. Acad. Scien., 



in, 1901, p. 532. 

 JALAPA HARVEST MOUSE. 



Type locality. Jalapa, State of Vera Cruz, Mexico. Altitude, 

 4,000 feet. 



Genl. Char. Similar to R. costaricensis, but paler; nasals truncate 

 posteriorly. 



