74 



ITORTH AMERICAN FAUN-A. 



[No. 36. 



Type locality. — San Jose, Costa Rica. 



Distribution. — Costa Eica and Chiriqui, Panama. 



Characters. — Similar to mexicanus, but colors brighter (more tawny, 

 less blackish); ears paler; skull larger. 



Color, — Upperparts varying from bright tawny to hazel, more or 

 less mixed with black on dorsal area; ears dusky hair-brown, scantily 

 haired; underparts white (rarely washed with yellowish buff); tail 

 fuscous, unicolor, clothed with short, bristly hairs; fore and hind feet 

 pale sepia, broadly edged with whitish; toes buffy white. 



SlcuU. — Larger than that of mexicanus, with longer rostrum; brain- 

 case more inflated. 



Measurements. — Average of 7 adults from Costa Rica (San Pedro 

 and La Carpintera): Total length, 191 (182-198); tail vertebrae, 111 

 (103-123); hind foot, 20 (19.5-20.5). Average of 13 adults from 

 Boquete, Chiriqui: Total length, 207 (192-227); tail vertebrae, 126 

 (115-140); hind foot, 20 (19-22). Skull: (See table, p. 81). 



Remarlcs. — Through an unfortunate mixing of skulls this species 

 was originally described as a Eesperomys [ = Peromyscus] and a few 

 years later, before the mistake was discovered, redescribed as 

 ReitJirodontomys costaricensis/' by which name it has usually been 

 known. Osgood has sho^^rn the pertinence of the original description 

 to the present species and has selected a type specimen from the 

 original series.^ 



The species is one of the larger members of the genus, though not so 

 large as R. t. tenuirostris and R. Jiirsutus. Intergradation with mexi- 

 canus seems probable, though not perfectly shown by the material 

 at hand. A specimen from Jacaltenango, Guatemala, is somewhat 

 intermediate in characters, but apparently nearest to mexicanus. 

 Specimens from Boquete, Chiriqui, have somewhat longer tails than 

 the series from Costa Rica. A single specimen from Nicaragua is 

 much less tawny than the type series, somewhat resembling the Gua- 

 temala specimen. 



Specimens examined. — Total number, 21, from the following locali- 

 ties: 



Costa Rica: La Carpintera, 3;^ San Jose, 2;^ San Pedro, 3.^ 

 Panama: Boquete, Chiriqui, 13.^ 



REITHRODONTOMYS MILLERI Allen. 



Colombian Haevest Mouse. 



Eeithrodontomys milleri Allen, Bull. Am. Mus. Nat. Hist., XXXI, 1912, p. 77. 



Type locality. — Munchique, Cauca, Colombia (altitude, 8,325 feet). 

 Distribution. — Known only from Colombia (altitude 6,000 to 10,300 

 feet). 



1 Proc. Biol. Soc. Wash. XX, 1907, p. 50. 

 s Colleotion Am. Mus. Nat. Hist. 



8 Eleven in Collection Mus. Comp. Zool. 



