Species: Isoperla fulva

F - 20,000-200,000 square km (about 8000-80,000 square miles) - F - Stewart and Oswood (2006) list range as western North American mountains from New-Mexico-California northward to Alberta-British Columbia. Since this species is difficult to separate from <i>I. karuk </i>(see Baumann and Lee, 2009) in both the male and female adult stages without extruding the aedeagus or studying the eggs, the identity of specimens previously listed as <i>I. fulva </i>from California is questionable. Jewett (1960) in his study of the California stonefly fauna listed two records for <i>I. fulva: </i>one in El Dorado County and one in Modoc County. Later, Szczytko and Stewart (1979) listed two additional records: Plumas County and Modoc County (Oregon).