Acroneuria perplexa Frison .

This species has been reported from Oklahoma east to West Virginia (Stark 2004). Most historical records from Illinois, with the exception of one collection from the Sangamon River, are from the Ohio River. DeWalt et al. (2005) listed it as extirpated from the state. Grubbs (2004) presented records from several counties in Indiana, represented only by specimens collected prior to 1950.

Examination of museum and new material indicate a broader distribution and confirm its continued presence in Indiana. IL, Wabash Co., Mt. Carmel, 6/17/1947, B.D. Burks, M.W. Sanderson, ♂, ♀ (CNC) ; IN, Brown Co., Yellowwood Lake, [39.18118, - 86.35254], 6/26-30/1946, E. Mockford, 4♂ (CNC) ; Dubois Co., [16 km NNE Birdseye], SIPAC (Southern Indiana-Purdue Agricultural Center), [38.45634, -86.68852], 6/12/2005, light trap, ♂, ♀ (PERC) ; Lawrence Co., FPAC (Felden Purdue Agricultural Center), [2.2 km NNE Eureka], [38.89544, -86.55705], 6/26/2005, light trap, ♂ (PERC) ; Martin Co., East Fork White River, 0.5 km SSW Shoals, 38.659, -86.8023, 6/20/2006, R.E. DeWalt, 49♂, ♀ (INHS) ; [East Fork] White River at Hindostan Falls Public Fishing Site, [38.62196, -86.8479], 6/20-21/1974, A.V. Provonsha, L. Dersch, 5♂ (PERC) ; Shelby Co., Shelbyville, 6/22/1962, Freeman, Lewis, ♂ (CNC) .