Biomonitoring of Ohio streams by the Ohio Environmental Protection Agency has found new state records for the Ephemeroptera (mayflies): Baetis brunneicolor McDunnough, Iswaeon anoka (Daggy), Paracloeodes fleeki McCafferty and Lenat, Plauditus cestus (Provonsha and McCafferty), and Rhithrogena manifesta Eaton; the Plecoptera (stoneflies): Pteronarcys cf. biloba Newman; the Trichoptera (caddisflies): Brachycentrus numerosus (Say) and Psiloireta rufa (Hagen); and the Coleoptera (beetles): Gyretes sinuatus LeConte, Dicranopselaphus variegatus Horn, and Microcylloepus pusillus (Le Conte). Additional records are given for the mayfly Paracloeodes minutus (Daggy).