1904.] Allen^ Mammals from Tropical America. 45 



The collector's measurements of 4 males and 3 females are 

 as follows: 



$ , Total length, 420; tail vertebrae, 215; hind foot, 55. 



$, " " 393; " 190; " " 55- 



*, 382; ' 180; 55- 



3, 375". 167; 5 1 - 



2, 405; ' 198; 57. 



$, 38o; ' 173; 51- 



?. 385; ' 172; 55- 



7. Mus musculus Linnaus. Three specimens, Volcan de 

 Irazu, Feb. 23 and March 3.^ 



8. Mus rattus Linnaus. Three specimens, Juan Vinas, 

 March 14-16. 



9. Peromyscus nudipes (Allen). Nineteen specimens, 

 Rancho de R. Jimenez, Juan Vinas, and other neighboring 

 points in the Irazu Range, Feb. 25-April 4. (For measure- 

 ments, etc., see below, p. 68.) 



10. Oryzomys devius Bangs. Two old adults, Volcan de 

 Irazu, March 4. 



These specimens are in heavier pelage and rather more 

 deeply colored than topotypes of O. devius from Boquete, 

 Chiriqui, and are also older, but on the whole agree so well 

 with them, especially in cranial characters, that they are 

 provisionally referred here. 



11. Oryzomys couesi (Alston). One specimen, adult 

 female, Rancho de R. Jimenez, Volcan de Irazu, April 13. 



12. Reithrodontomys costaricensis Allen. Ten specimens, 

 6 adults and 4 young, San Pedro, June 29. The adults 

 measure: Total length, 189 (182-205); tail vertebrae, 112 

 (103121); hind foot, 20.3 (19.5 20.5). The young specimens, 

 two-thirds grown, resemble in coloration an average example 

 of Mus m^tsc^llus, excepting a tinge of bright rufous on the 

 head, shoulders, and flanks, due to the incoming of the adult 

 coloration. 



13. Reithrodontomys australis Allen. Twenty-five speci- 



