PEROMYSCUS. 45 



Subgenus Megadontomys. 



Peromyscus pirrensis Goldman. 



Peromyscus pirrensis Goldm., Smith. Misc. Coll., LX, No. 2, 1912, 



P- 5- 



Type locality. Near head of Rio Limon, Mount Pirri, eastern 

 Panama. 



Gent. Char. Size large, similar to P. fiamdus, but with a longer 

 hind foot; color darker. Skull with a slender rostrum, first upper 

 molar very narrow. 



Color. Upperparts cinnamon-rufous, the black bases of hairs 

 showing; rump rusty; flanks orange-buff; underparts creamy white; 

 fingers of hands white; hind feet whitish, the metatarsus brown; 

 tail brown above, slightly paler beneath. Ex type in United States 

 National Museum. 



Measurements. Total length, 348; tail, 185; hind foot, 35.5. 

 Skull: Occipito-nasal length, 40.5; Hensel, 31.5; zygomatic width, 

 19; intertemporal width, 6; length of nasals, 15.3; length of upper 

 molar series, 5.7; length of mandible, 17; length of lower molar series, 

 5.7. Ex type in United States National Museum. 



Subgenus Haplomylomys. 



Peromyscus eremicus insulicola Osgood. 



Peromyscus eremicus insulicola Osgood, N. Am. Fauna, No. 28, 

 1909, p. 246. 



Type locality. Espiritu Santo Island, off east coast of Lower 

 California, Mexico. 



Gent. Char. Similar to P. e. eva, but somewhat darker; pectoral 

 stripe prominent. 



Color. Upperparts mixed ochraceous-buff and dusky; underparts 

 creamy white; buff line on center of chest; tail above dusky, lighter 

 beneath. Ex type in United States National Museum. 



Measurements. Total length, 196; tail. 115; hind foot, 20; ear, 

 16.5. Skull: Occipito-nasal length, 25.3; Hensel, 18.9; zygomatic 

 width, 12.4; intertemporal width, 3.9; length of nasals, 8.5; length of 

 upper molar series, 3.9; length of mandible, 11.2; length of lower 

 molar series, 3.7. Ex type in United States National Museum. 



Peromyscus eremicus avius Osgood. 



Peromyscus eremicus avius Osgood, N. Am. Fauna, No. 28, 1909, 

 p. 247. 



