Species: Oreohelix strigosa

H - >2,500,000 square km (greater than 1,000,000 square miles) - H - Occurs generally throughout the mountainous areas of interior western North America. Known from southeastern British Columbia, extreme southeastern Alberta, eastern Washington, extreme northeastern Oregon, northern and extreme southeastern Idaho, western Montana, extreme western South Dakota (i.e., the Black Hills), extreme western Wyoming, extreme eastern Nevada, nearly all of Utah, Colorado except the eastern third, northern and eastern Arizona, and northern and central New Mexico (Pilsbry 1939; see also Bequaert and Miller 1973). Known also as a Pleistocene fossil in Iowa and Illinois (Pilsbry 1939, Morrison 1943, Frest and Rhodes 1981). Pilsbry (1939) commented on the discontinuities in the northern and northwestern parts of its range (i.e., Washington and Oregon). Disjunct populations are also apparent at the northeastern and southern limits of distribution, some notable examples of such disjunct--probably Pleistocene relictual--populations being those in the Black Hills (South Dakota), the White Mountains (Arizona), and the Sierra Blanca (New Mexico).