FE ee a le a ee, 
APRIL, 1914. MAMMALS OF NORTHERN PERU — OsGoop 165 
Phyllotis andium Thomas. LrAr-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 (109-131); hind foot 24.8 (24~-26.5). 
-Phyllotis andium stenops subsp. nov. 
Type from the Rio Utcubamba, 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 (222-249); 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 (3.74.5). 
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. haggard: in greater length of tail. 
Phyllotis tamborum sp. nov. 
Type from Tambo Carrizal, mountains east of Balsas, Peru. Allti- 
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. 
