Males
1. Tip of outer member of pariprocts expanded and bearing a group of large spines separately from inner member. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Amphinemura varshava
Tip of outer member slender, bound to inner member, with few short spines or no spines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Inner member of paraproct much produced rearward at bend, where it is thin and compressed; its tip unsclerotized and not recurved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. delosa
Inner member not compressed at the bend; its tip recurved at least on inner side . . A. nigritta
Females
1. Border of subgenital plate (8th sternite) with median notch and small but definite V- or U- shaped lateral notch on either side. . . . . . . . . . . . . . . . . . . . . . . . . Amphinemura delosa
Border of plate merely sinuate laterally or, less commonly, with broad V-shaped notch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. varshava & A. nigritta
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Key to the Adult Amphinemura of Ohio