Distribution and Habitat
Distributed from mainland British Columbia and Vancouver Island through Washington, Oregon, California, and the tip of Baja California. H. regilla can be found on Catalina, Santa Rosa, and Santa Cruz, islands off the coast of southern California, and on Isla Cedros, an island off the west coast of central Baja California. Distribution also goes east to eastern Nevada and western Montana. It lives in habitats from sea level to 11,000 feet in the Sierra Nevada (Grisner 2002). It seeks cover in many places, including rock fissures, under bark, in vegetation along streams, in rodent and other burrows, in nooks and crannies in buildings, and in culverts. It can be found in springs, ponds, irrigation canals, streams, and other bodies of water, but it has also been found as far as ½ mile from water (Stebbins 1951). Out of the water, it frequents habitats like grassland, chaparral, woodland, desert oases, forest, and farmland (Stebbins 1985).