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Males

1.         Epiproct tip in dorsal aspect about as long as to twice as long as wide, convex dorsally, flat ventrally, with semicircular apex strongly sclerotized and barely visible serrulate; cowl not enlarged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Alloperla neglecta

            Epiproct tip bulbous or transversely reniform or longer than twoce witdth or deeper than wide, variously sculptured, spurrrd, serrulate, haired; cowl enlarged or not. . . . . . . . . . . . . . . . . . . . . . . .  2

2.         Epiproct tip wit fine or prominent lateral serrae on distal portion visible in dorsal aspect OR epiproct tip rodlike and acuminate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. imbecilla

            Epiproct tip otherwise sculptured or spurred, BUT not visibly serrulate . . . . . . . . . . . . . . . . . 3

3.         Epiproct tip ovoid or pyriform or saddle-shaped, pilose with short, fine, appressed hairs . . . . . 4

            Epiproct tip bulbous wit long, nearly erect hairs OR epiproct tip nearly flat . . . . . . . . . . . . . . .6

4.         Epiproct tip ovoid or papilliform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. petasata

            Epiproct tip pyriform or saddle-shaped . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

5.         Epiproct tip enlarged slightly distally in lateral aspect . . . . . . . . . . . . . . . . . . . . . . A. caudata

            Epiproct tip with two ventral lobes or saddle-shoped . . . . . . . . . . . . . . . . . . . . . . . . . .A. idei

6.         Epiproct tip nearly triangular in dorsal aspect  . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. chloris

            Epiproct tip notched apically in dorsal aspect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  A. usa

 

Females

1.         Free flap of subgenital plate with broadly arced posterior margin; flap slightly overlapping sternum 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

            Free flap of subgenital plate angular; flap slightly to mostly overlapping sternum 9 . . . . . . . . .4

2.         Flap a broad shallow rectangle; 6.5-7.0 mm . . . . . . . . . . . . . . . . . . . . . . . .Alloperla chloris

            Flap a shallow crescent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. idei

3.         Flap with margins nearly straight, beginning almost at lateral edges of plate and meeting at right angle; flap (exclusive of remainder of plate) longer than half length of abdominal segment; apex of triangular flap usually slightly nipplelike in outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A. neglecta

            Flap with margins incurved, meeting at right, acute or obtuse angle; flap (exclusive of remainder of plate) shorter than or longer than half length of abdominal segment; apex of triangle of flap not nipplelike in outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4.         Flap with margins incurved medially so flap resembles isosceles triangle centered on broadly curved base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

            Flap with margins incurved at or immediately beyond margin of sternum 8 so flap appears to be only median triangular projection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. caudata

5.         Flap with length of triangle 80 percent of flap length; head posterior to compound eyes usually slightly elongate; 10.0 12.0 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. usa

            Flap with length of triangle 50 to 70 percent of flap length; head posterior to compound eyes not usually as elongate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6

6.         Flap with length of triangle 50 to 60 percent of flap length . . . . . . . . . . . . . . . . .  A. petasata

            Flap with length of triangle 60 to 70 percent of flap length . . . . . . . . . . . . . . . . . A. imbecilla

 

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