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Range DescriptionThis species ranges from southwestern British Columbia in Canada, south through the Coastal Ranges of the USA to extreme northwestern Baja California and the Sierra San Pedro Martir, Baja California in Mexico (Mahrdt et al. 1998); and along the western slopes of Cascade Range and Sierra Nevada in California in the USA. It is absent from Sacramento-San Joaquin valley, California. It occurs as a large number of separate subspecies. The subspecies E. e. klauberi occurs in the Sierra San Pedro Martir, Baja California, Mexico, above 2,000m asl. It occurs from sea level up to elevations of about 2,350m asl (Stebbins 1985). See Moritz et al. (1992) for a general but up-to-date distribution map.