MICROTUS. 
306. umbrosus (Microtus), Merr., Proc. Biol. Soc. 
pp. Loy. 
Mount ZEMPOALTEPEC MEADOW VOLE. 
Type locality. Mt. Zempoaltepec, State of Oaxaca, Mexico. 
Altitude, 8,200 feet. 
Geogr. Distr. State of Oaxaca, Mexico. 
Genl. Char. Size rather large; tail long; ear short: color dark. 
5? 
Wash., XII, 1898, 
) 
Color. Above dusky, mixed with brown; under parts slate, 
tinged with fulvous. 
Measurements. Total length, 184; tail vertebre, 65; hind foot, 
23. Skull: occipito-nasal length, 28; Hensel, 24.5; zygomatic width, 
Fig. 54. Microtus (HERPETOMYS) GUATEMALENSIS. 
No. 76793 U.S. Nat. Mus. Coll. Twice nat. size. 
UPPER TOOTH ROW. LOWER TOOTH ROW. 
Enlarged 6 times. Enlarged 6 times 
