Ohio Stoneflies

Males

1.         Fully everted aedeagus with dorsal caecum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

            Fully everted aedeagus withtout dorsal caecum . . . . . . . . . . . . . . . . . Perlesta teaysia

2.         Epicranial arms extend well beyond ocelli as a distinct dark line; occiput almost entirely dark brown; mesothoracic and metathoracic basisterna usually dark, at least mesally; general habitus very dark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

            Epicranial arms extend only slightly beyond ocelli as a distinct dark line; occiput with at least some areas of pale pigment; mesothoracic and metathoracic basisterna pale, at least mesally; general havitus pale to moderately dark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.         Dorsal aedeagal patch short, less than half tube length, forming a broad saddle-like patch over tip of tube and caecum base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. adena

            Dorsal aedeagal patch more than half tube length, relatively slender through much of length, and not usually forming a broad saddle over tube . . . . . . . . . . . . . . . . . . . . . . . P. xube

4.         Paraproct spine distinct in lateral aspect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

            Paraproct spine obscure in lateral aspect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5.         Dorsal aedeagal patch covers about 1.3 of tube surface length; forewing length 6-7 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. shubuta

            Dorsal aedeagal patch covers most of tube surface length; forewing length 8-10 mm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. decipiens

6.         Dorsal aedeagal patch with lateral margins darker than mesal field; ocelli usually connected by V-shaped area with pale center . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. golconda

            Dorsal aedeagal patch without contrasting bands; ocellar area completely dark . . P. lagoi

Females

1.         Epiccranial arms extenc well beyond ocelli as a distinct dark line; occiput almost entirely dark brown; mesothoracic and metathoracic basisterna usually dark at least mesally, general habitus very dark. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

            Epicranial arms extend only slightly beyond ocelli as a dark line; occiput with areas of pale pigment; mesothoracic and metathoacic basisterna pale at least mesally, general havitus pale to moderately dark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.         Subgenital plate lobes truncate, notch only slightly wider at margin than at base. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. xube

            Subgenital plate lobe rounded, notch wider at margin than base . . . . . . . . . . . P. adena

3.         Wing membrane, veins and body pale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. teaysia

            Wing membrane amber to dark brown, veins pale brown to dark brown, body with areas of dark pigment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

4.         Egg collar stalked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

            Egg collar button-like . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. lagoi

5.         Subgenital plate lobes truncate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

            Subgenital plate lobes rounded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. golconda

6.         Forewing length 8-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. shubuta

            Forewing length 12-13 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. decipiens

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