1914.] EEITHRODONTOMYS MEXICAISTUS GROUP. 73 



latter with a faint tinge of pale buff; ears dark hair-brown; tail 

 fuscous, nearly unicolor or slightly paler beneath; fore and hind feet 

 grayish white, tinged with dusky; ankles hair-brown. 



SlcuU. — Longer and relatively narrower than that of mexicanus; 

 braincase flattened, and narrowed posteriorly; rostrum and nasals 

 longer, the latter narrowed to a point posteriorly; audital bullse 

 slightly larger; palatal foramina wide. 



Measurements. — Type: Total length, 190; tail vertebrae, 109; hind 

 foot, 21.5. Skull: (See table, p. 81). 



Remarks, — This subspecies is the most northerly ranging member 

 of the group. It occupies the low, arid, coast region of northern 

 Puebla and probably adjacent States. It is distinctly paler than 

 mexicanus and the skull of the type shows pronounced characters. 



Fig. 6. — Distribution of Reithrodontomys viexicanus, R. gracilis, and subspecieg. 



some of which, however, may not prove to be constant. Two speci- 

 mens from Huauchinango, Puebla (altitude 5,000 feet) are inter- 

 mediate between goldmani and mexicanus, the skulls being nearer to 

 the latter form, the skins nearer goldmani. 



Specimens examined. — Total number, 3, from the following local- 

 ities in Mexico : 



Puebla: Huauchinango, 2; Metlaltoyuca, 1. 



REITHRODONTOMYS MEXICANUS CHERRII (Allen). 



Central American Harvest Mouse. 



(PL III, fig. 5; PL VI, fig. 5.) 



Hesperomys {Vesperimus) cherrii Allen, Bull. Am. Mus. Nat. Hist., Ill, 1891, p. 211. 

 Sitomys cherriei Allen, Ibid., V, 1893, p. 238. 



Reithrodontomys costaricensis Allen, Ibid., VII, 1895, p. 139 (La Carpintera, Costa Rica). 

 Reithrodontomya cherriei Osgood, Proc. Biol. Soc. Wash., XX, 1907, p. 50 (type fixed). 



