Isoperla frisoni Illies .

This species is known from Indiana north through the upper Great Lakes region and from North Carolina north through eastern Canada (DeWalt et al. 2010). Frison (1937) originally described it as Isoperla truncata (a homonym) with a paratype from the Yellow River, a sand-bottomed stream in northern Indiana. This species has never been collected from Illinois, but could be present in the Kankakee and Rock River drainages.

We present a few new locations in Indiana, including one recent record. IN, LaGrange Co., Pigeon Creek at [CR] 1100 E, E Pigeon River Fish-Game Area, 41.6728, - 85.21492, 5/20/1972, ♀ (PERC) ; LaPorte Co., Trail Creek, Michigan City, [41.7237, -86.8719], 6/21/1957, J. Lowe, 3♂ (CNC) ; same location, 4/22/2007, R.E. DeWalt, 6N (INHS) .