APRIL, 1914. MAMMALS OF NORTHERN PERU OSGOOD 165 



Phyllotis andium Thomas. LEAF-EARED MOUSE. 



Sixteen specimens: Cajamarca (8), Hacienda Limon, near Balsas 

 (4), Hacienda Llagueda (2), mountains near Otuzco (2). 



In external appearance and in habits, these mice strongly suggest' 

 certain species of Peromyscus inhabiting western North America. 

 They were found principally in relatively dry and rocky situations and 

 were nowhere abundant. 



Average measurements of seven adults are as follows: Total length 

 232 (211-244); tail 119 (109131); hind foot 24.8 (24-26.5). 



Phyllotis andium stenops subsp. nov. 



Type from the Rio Uteubamba, 15 miles above Chachapoyas, Peru. 

 No. 19840 Field Museum of Natural History. Adult male. Collected 

 May 30, 1912, by W. H. Osgood and M. P. Anderson. Orig. No. 4805. 



Characters. Similar in general to the typical form; tail averaging 

 slightly longer; ears darker-colored; nasals and rostral part of skull 

 decidedly narrower. Upper parts ochraceous buff to clay color mixed 

 with dusky to produce a general effect near wood brown; sides of face 

 more or less grayish; under parts washed with creamy or buff; feet white; 

 tail sharply bicolor. 



Measurements. Type: Total length 249; head and body 117; 

 tail 132; hind foot 26.5; ear from notch (dry) 18.5. Average of six 

 adults: Total length 236 (222249); tail 126 (120-134); hind foot 

 24.7 (24-26.5). Skull of type: Greatest length 29.2; basilar length 

 22.9; zygomatic breadth 14.4; interorbital constriction 4; nasals 11.3 x 

 3.3; palatine foramina 6.8; diastema 7.6; upper toothrow 4.5; average 

 width of nasals in 8 adults 3.32 (2.9-3.8); average width of nasals in 7 

 adults of P. andium 3.94 (3.7-4.5). 



Remarks. Like the Akodon and other rodents, the Phyllotis of the 

 eastern cordillera differs in certain slight but constant characters from 

 that of the western cordillera. Eleven specimens from Chachapoyas 

 and vicinity are characterized principally by the narrowness of their 

 nasals as contrasted with P. andium from Cajamarca. Both forms 

 differ from P. haggardi in greater length of tail. 



Phyllotis tamborum sp. nov. 



Type from Tambo Carrizal, mountains east of Balsas, Peru. Alti- 

 tude .5,000 ft. No. 19,838 Field Museum of Natural History. Adult 

 female. Collected May 18, 1912, by W. H. Osgood and M. P. Anderson. 

 Orig. No. 4,745. 



