Acroneuria frisoni Stark & Brown .

This is the most frequently collected Acroneuria in the southern Midwest. It is known from the western Ozark Mountains through Maryland, north to Ontario and south to North Carolina (Chabot 2010). Although this species once inhabited streams in the till plain of north central Indiana and Illinois (Grubbs 2004, DeWalt et al. 2005), there are no recent records from this region.

We have since located one population in northeastern Indiana at the till plain/drift plain boundary. IN, Steuben Co., Fish Creek, 3.7 km E Hamilton along CR 775S, Douglas Woods Nature Preserve, 41.5327, -84.8688, 6/23/2006, R.E. DeWalt, 3♂, ♀ (INHS) .