Males 

1.         Basal processes of epiproct twisted, divergent, and more than half as long as epiproct . . . . . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prostoia similis

            Basal processes of epiproct short (less than one sixth as long as epiproct), appressed and easily             overlooked. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  P. completa

Females

1.         Sternite 8 distinctly produced laterally and with large notch medially . . . . . . .  Prostoia similis

            Sternite 8 little or not at al produced; median notch small or absent . . . . . . . . . .  P. completa

 

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Stoneflies of Ohio

Key to the Adult Prostoia of Ohio

(Modified from Hitchcock, 1974)