Rare aquatic beetles: Species distribution models guide field surveys

The known range of the narrow-footed Hygrotus diving beetle, which also can fly, is in central Wyoming, in the Powder River Basin and one site in the Wind River Basin. The sites are small, intermittent streams with disconnected pools and contain high concentrations of salt. These streams are in shortgrass prairie ecosystems that receive less than 400 millimeters of precipitation each year.