This paper presents the results of a study of the mammals of the San Gabriel Mountains of southern California, and supplements the more extensive reports on the biota of the San Bernardino Mountains by Grinnell (1908), on the fauna of the San Jacinto Range by Grinnell and Swarth (1913), and on the biota of the Santa Ana Mountains by Pequegnat (1951). The primary objectives of my study were to determine the present mammalian fauna of the San Gabriel Mountains, to ascertain the geographic and ecol

The San Gabriel Mountains are approximately sixty-six miles long, and average twenty miles wide. The main axis of the range trends nearly east and west, and extends from longitude 117°25' to longitude 118°30'. The widest part of the range is bounded by latitude 34°7' and latitude 34°30'. The San Gabriel Mountains connect the Sierra Nevada with the Peninsular Ranges of southern California and Baja California. On the west the San Gabriels are bordered by the Tehachapi Mountains, which stretch nort

Artemisia californica Salvia apiana Salvia mellifera Eriogonum fasciculatum Rhus integrifolia Opuntia occidentalis Haploppapus squarrosus This association is restricted to the Pacific base of the range, is typical on the alluvium at the bases of the coastal foothills, and usually grades into the chaparral at about 1800 feet elevation. When seen from above, the rather level terrain of the association is broken sharply at the mouths of canyons by dry washes, and is limited below, to the south, by

The opossum is common in and near small towns and cultivated areas at the Pacific base of the mountain range and does not thrive away from human habitation; extensive trapping in the coastal sage and chaparral belts produced no specimens except immediately adjacent to citrus groves. Pequegnat (1951:47) mentions that opossums in the Santa Ana Mountains of southern California are in the lower parts of the larger canyons, especially near human habitation. Specimens examined. —Los Angeles County: Cl

Benson, S. B. 1930. Two new pocket mice, genus Perognathus , from the Californias. Univ. California Publ. Zool., 32:449-454. 1949. The bat name Myotis ruddi Silliman and von Bloeker, a synonym of Myotis volans longicrus (True). Jour. Mamm., 30:48-50. Borell, A. E. 1937. A new method of collecting bats. Jour. Mamm., 18:478-480. Burghduff, A. E. 1935. Black bears released in southern California. California Fish and Game, 21:83-84. Burt, W. H. 1932. The systematic status and geographic range of the

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