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DistributionAptostichus aguacaliente is distributed primarily throughout Colorado Desert habitat in the low-lying ridges surrounding the Imperial Valley (Map 27). County records comprise San Bernardino, Riverside, and Imperial. The DM (Map 28) appears to considerably overpredict the occurrence of Aptostichus aguacaliente in areas to the west in Riverside County and into eastern San Diego County but otherwise corresponds to the known distribution. Based on the DM, it was likely that the species was more widely distributed throughout the Imperial Valley and areas to its north prior to the extensive agricultural development that has occurred in the region. Males appear to wander in the late winter, early spring, January–February. Female burrows can be detected during the winter months often after soaking rains when individuals extend their burrow leaving a small mound of soil at the burrow entrance.