DistributionRead full entry
Range DescriptionThis species is restricted to the north-central Midwest of the United States. The present range includes disjunct populations in Michigan, Ohio, Illinois, Indiana, and Kentucky. Most recent records for the Great Lakes region are clustered near the southern end of Lake Michigan (Cook County, Illinois; northwestern Indiana; and southwestern Michigan) and in Lucas County, Ohio (Toledo area) (Harding 1997). The Kentucky distribution is along the Ohio River valley (Barbour 1971). Historically, the range included northeastern and central Illinois, most of Indiana and Ohio, north-central Kentucky, southern Michigan, western Pennsylvania, and extreme northeastern Missouri. Records from southeastern Wisconsin and from eastern Pennsylvania have been regarded as erroneous (Conant 1943). The species was last recorded in Pennsylvania in 1965. Historically, Wisconsin and Missouri were at best extreme peripheral locations; known in Wisconsin from a single unsubstantiated report in 1883 (Hoy 1883, Vogt 1981); known in Missouri from a single record in 1964 (Jones 1967, Johnson 1987). The area of occupancy within its range is small.