Owing to the paucity of extensive areas of grassland in the San
Gabriels, this is one of the least common rodents of the area. It
inhabits, however, even small patches of grassland up to 4000 feet
elevation on the Pacific slope, and is locally plentiful. For example, a
small patch of grassland amid the chaparral at the mouth of Palmer
Canyon supported many _Microtus_, and in San Antonio Canyon at about
3000 feet elevation meadow mice were found amid boulders and yuccas in a
small grassy area near the stream.
_Specimens examined._--Total, 3, distributed as follows: Los
Angeles County: San Antonio Canyon, 2800 ft., 1; Palmer Canyon,
2100 ft., 1; 4 mi. N Claremont, 1800 ft., 1.