1. Adult and subimago with vestiges of gill sockets on abdominal segment 3; eggs with one polar cap and usually somewhat smooth chorion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Adult and subimago without vestiges of gill sockets on abdominal segment 3; eggs without polar caps, edds with two polar caps, or if eggs with one polar cap, then with reticulate chorion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminal segment of male genital forceps more than twice as long as broad; inner mergin of long second segment distinctly incurved or storngly bowed. . . . . . . . . . Drunella cornutella
Terminal segment of male forceps less than twice as long as broad; inner mergin of long second segment variable but not strongly bowed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Penes with dorsal and/or ventral spines and shaped as Fig. 1.2, or with long anterolateral lobes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ephemerella
Penes not as above, without dorsal and/or ventral spines. . . . . . . . . Teloganopsis deficiens
3. Penes of male genitalia broadest at base, narrowing apically; eggs without polar caps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Eurylophella
Penis of male genitalia laterally expanded apically, somewhat narrower vasally; eggs with polar caps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dannella
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Key to the Genera of Ohio Adult Ephemerellidae