Isoperla richardsoni Frison, 1935

Grubbs, Scott A., Pessino, Massimo & DeWalt, R. Edward, 2012, Michigan Plecoptera (Stoneflies): Distribution Patterns And An Updated Species List, Illiesia 8 (18), pp. 162-173 : 171

Isoperla richardsoni Frison

Collection records. USA, Michigan: Arenac Co., Rifle River, Omer , 44.0477, -83.8561, 21. V.1936, T.H. Frison and H.H. Ross, 7♂, 10♀ ( CNC) ; Benzie Co., Betsie River, Benzonia , 44.6214, -86.0992, 27. V.1939, T.H. Frison and H.H. Ross, ♀ ( CNC) ; Crawford Co., North Branch Au Sable River , 2 mi upstream Lovells, 44.8276, -84.4910, 2. V.1936, J.W. Leonard, ♂ ( CNC) ; Ingham Co., Red Cedar River , 42.7316, -84.4869, 21. V.1891, no collector information, 8♂, 1♀ ( MSUC) ; Lake Co., Pine River, near Skookum , 44.0794, - 85.6430, 27. VI.1938, R.P. Bohland, 3♀ ( CNC) ; Mason Co., Big Sable River , Free Soil, 44.1146¸-86.2084, 26. V.1939, T.H. Frison and H.H. Ross, ♀ ( CNC) ; Mecosta Co., Muskegon River, Big Rapids , 43.6987, - 85.4771, 22. V.1936, T.H. Frison and H.H. Ross, 2♂, 3♀, 1 nymph ( CNC, INHS) ; Schoolcraft Co., Manistique River, Germfask at MI-77, 46.2321, - 85.9288, 1. VI.2010, R.E. DeWalt, M. Pessino, M.M. Brown, and E.W. Hernandez, 2 exuviae ( INHS) ; Washtenaw Co., Huron River, Ann Arbor , 42.2887, - 83.7405, 18. V.1919, T.H. Hubbell, ♀ ( UMMZ); same but 15.V.1936, J.A. Oliver, ♀ (CNC); same but 29.V.1939, D.L. Cantrall, 2 nymphs (UMMZ); Huron River, Delhi Mills , 42.3338, -83.8099, 6. V.1937, J. Friouf, nymph ( UMMZ); same but 23.V.1938, F.E. Lyman, ♂, 3♀ (UMMZ); Huron River , T2 S, R5 E, S2, 42.3338, -83.8093, 6. V.1937, F.E. Lyman, 9 nymphs ( INHS) .

Comments. Although this species has been collected from several localities in the Upper and Lower Peninsulas, with one exception (Schoolcraft Co., Manistique River) all material were obtained prior to 1940. This species appears to have experienced a marked range reduction.