426 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



Mexican Border. No. 61033 (figs. 93 and 94) , an adult female, furnished 

 the following measurements, taken from the fresh specimen by the 

 author: Length of head and body, 93 mm. ; ear from crown, 19.2 ; length 

 of hind foot, 23; longest whisker, 50. Skull, 29 by 14. No. ff||, an 

 adult male, measured: length, 203 mm.; tail vertebra*, 115; ear from 



Fig. 93.— Peromyscus martikensir. Skull, a, dorsal view; h, ventral view; c, lateral 



VIEW. 



crown, 19; length of hind foot, 23. The ears are of enormous size 

 and nearly naked. Tail well haired and sharplj'^ bicolor. Soles of feet 

 hairy at the heel. AVliiskers very long, extending back of the 

 shoulders. Pelage long, dense, and silky. Feet and under parts 

 pure white, with a trace of an ochraceous pectoral patch, as in the 

 type of P. truei. Vent rusty. Ears dark purplish brown, coated 

 only with sparse, downy hairs. Above yellowish drab, grayer on 

 the muzzle and nape, thicky lined with dusky 

 annuli and tips to the hairs, and bordered by a 

 l.ne of ochraceous buff extending along the sides 

 from the cheeks to the rump. 



Remarks. — Tliis huge-eared mouse, though 

 closely related to Peromyscus truei (Shufeldt) is 

 apparently distinct. It is about the same size. 

 The type of P. truei, a very old male specimen, is 

 distorted, having the skin bunched up in such a 

 manner that it is impossible to obtain by meas- 

 urement an approximation to its original size. It 

 presents the following dimensions: Tail, 76 mm. 

 (to end of pencil, 86); ear from notch (about), 

 longest wdiisker, 48. It is of much the same color as typical Peromys- 

 cus eremicus. Tlie pelage is very long, dense, and silky, the fur meas- 

 uring 16 mm. in length on the back. The ears are flesh-colored and 

 sparsely coated with short grayish down. The dorsum is a mixture 

 of drab and ochraceous buff finely mixed with black. The color is 

 given by the tips of the hairs, l^etween which the slate-colored basal 



Fig. 94.— Peromyscus 

 martirensis. Crowns 



OF MOLAR teeth. O, 

 LOWER series; 6, UPPER 

 SERIBS. 



21; hind foot, 21; 



