86 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



Under the same name Allen (1904, p. 70) records six specimens 

 taken at Boquete by J. H. Batty. Two examples too young for 

 identification listed by Thomas (1903a, p. 41) from Cebaco Island 

 near the Pacific coast, may be referable to this form. 

 Specimens examined: Boquete, 34 *; Gatun, 1. 



Genus PEROMYSCUS Gloger 

 The genus Peromyscus is remarkable for the inclusion of more 

 forms than any other mammalian genus in North America. The 

 species are forest mice, usually with long tails, rather large ears and 

 soft fur. They are usually, but not invariably, distinguishable from 

 the species of Oryzomys, a related genus, by the softer fur, larger 

 ears, and smaller, more densely haired, hind feet ; several other allied 

 genera are similar externally and difficult to determine without 

 recourse to detailed differential characters presented by the skull. 

 While so numerous in North America in general, very few species 

 range so far south as Panama where they appear to be restricted to 

 the upper slopes of the mountains. 



Subgenus PEROMYSCUS Gloger 

 PEROMYSCUS NUDIPES (Allen) 



La Carpintera Mouse 



Hesperomys (Vcsperimusf) nudipes Allen, Bull. Amer. Mus. Nat. Hist., 

 Vol. 3, p. 213, April 17, 1891. Type from La Carpintera, Costa Rica. 



Peromyscus cacabatus Bangs, Bull. Mus. Comp. Zool., Vol. 39, No. 2, p. 29, 

 text figs. 8-10, April, 1902. Type from Boquete, Chiriqui, Panama. 



Peromyscus nudipes is a large member of the genus, but decidedly 

 smaller than P. Havidus which inhabits parts of the same area. It 

 measures 250 to 270 millimeters in total length, while this dimension 

 in the latter species is well over 300 millimeters. 



It is known in Panama only from the slopes of the Volcan de 

 Chiriqui where it was collected by W. W. Brown, Jr. It was de- 

 scribed by Outram Bangs under the name P. cacabatus, which I 

 agree with Allen (1904, p. 6j) and Osgood (1909, p. 195) in identi- 

 fying with P. nudipes. Brown found it by far the commonest small 

 mammal of the mountain forest belt of the Volcan de Chiriqui 

 where it does not appear to' occur below 4,000 feet and extends 

 thence upward to at least 7,500 feet elevation. 



Specimens examined: Boquete, 116 2 (including type). 



1 Twenty-eight specimens in Mus. Comp. Zool. ; six in Amer. Mus. Nat. Hist. 

 8 103 in Mus. Comp. Zool. ; n in Amer. Mus. Nat. Hist. 



