Updates To The Stonefly Fauna Of Illinois And Indiana Author DeWalt, R. Edward Author Grubbs, Scott A. Department of Biology and Center for Biodiversity Studies Western Kentucky University Bowling Green, KY 42101 U. S. A. text Illiesia 2011 2011-01-31 7 3 31 50 journal article http://doi.org/10.5281/zenodo.4760399 f4c5df5c-bfc2-427a-933a-59bd8530b0a7 1854-0392 4760399 Isoperla montana (Banks) . This species exhibits mainly a central and northern Appalachian distribution ( DeWalt et al. 2010 ). Males have one spur at the base of the aedeagus, compared to two on I. namata Frison. Nymphs of the two species are currently indistinguishable. We present specimen data from an Indiana ravine stream. The senior author tentatively identified them as I. namata , but they were later identified as I. montana by B.C. Kondratieff. This constitutes a new state record for Indiana and large range extension into the Midwest. The presence of this species calls into question the identification of nymphs in the region as I. namata . Further investigations are ongoing. IN , Montgomery Co. , Tributary Sugar Creek along IN-234 at pull-off, 39.9484 , -87.0583 , 5/4/2008 , R.E. DeWalt , ♂ , 2♀ , ( INHS ) .