The eastern North American dobsonfly, Corydalus cornutus (L.), is newly reported from 78 counties in Kentucky, U.S.A. Additionally, 35 previous county records from Kentucky are included. The larvae, known as hellgrammites, have been documented from 94 percent of the counties in the state. Larvae were found in a variety of lotic environments, including streams previously impacted by strip-mining activities. Corydalus cornutus and the fishfly, Nigronia serricornis (Say), were sympatric in 43 of 458 streams sampled in Kentucky.
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