DistributionRead full entry
Global Range: (<100-250 square km (less than about 40-100 square miles)) A population in the northwest portion of Walker Basin, Kern County, California has been known for several decades. A second metapopulation, or perhaps several, was/were discovered in 2002 in Carrizo Plain, National Monument in adjacent San Luis Obispo County (Jump et al., 2006). No others were known to Tuttle (2007). These two are about 125 miles apart. USFWS (2007) also reports a population in the Cuyama Valley (county not stated). Intervening terrain is generally not suitable for the species so polygon connecting these three small ranges would not be a realistic range extent. The basis of the last is unclear, but the others are verified by specimens. With only three populations no meaningful current range extent can be given.