The mayfly fauna of New York state (Insecta : Ephemeroptera)

A total of 173 species of mayflies, representing 15 families and 45 genera. are reported from the state of New York. First stare records for;43 specie s and 891 new county reports for 129 species are included. Previously publi shed reports are summarized. and pertinent remarks on species are annotated . Thr occurrence of Dannella provonshai, Heptagenia julia. and Plauditus gl overi in New York represent significant range extensions. The discovery of Epeorus frisoni in New York represents only the second report of the specie s. Species potentially of environmental concern are noted.