THE EPHEMEROPTERA SPECIES OF NORTH-AMERICA AND INDEX TO THEIR COMPLETE NOMENCLATURE

A total of 672 species and subspecies of mayflies (Ephemeroptera) are listed for North America (Canada, Mexico, and the continental United S tates). Changes to the list are as follows: Callibaetis ferrugineus ha geni Eaten, 1885, new status [=C. americanus Banks, 1900, new synonym] and Callibaetis ferrugineus ferrugineus (Walsh), 1862, new status, ar e western and eastern subspecies, respectively; Camelobaetidius arriag a (Traver & Edmunds), 1968 [=C. chiapas (Edmunds & Traver), 1968, new synonym, =C. jenseni (Edmunds & Traver), 1968, new synonym]; Isonychia sicca (Walsh), 1862 [=I. edmundsi Kondratieff & Voshell, 1984, new sy nonym]; Tortopus puella (Pictet), 1843 [=T. incertus (Traver), 1935, n ew synonym]; and Lachlania saskatchewanensis Ide, 1941 [=L. powelli Ed munds, 1951, new synonym]. Ten species are listed as nomina dubia. A u tilitarian, alphabetical index to 1,428 different species names histor ically used for the North American fauna is provided. The checklist an d index serve as an initial basis for a continually updated electronic version available over the internet.