1. Robust setae on anterior (outer) surface of femur pointed (Fig.1.1). . . . . . . Nixe perfida
Robust setae on anterior surface of femur spatulate . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Maxilla with at least 15-20 comb setae on anterior margin; abdominal terga each with single pair of sublateral pale spots or nearly uniformly brown with rectangular pale area on posterior margins of terga 4 and 8 and small sublateral pale spot on terga 5-7; fibrils present on gill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Nixe rusticalis
Maxilla with fewer than 15 comb setae on anterior margin; abdominal terga each with two pairs of sublateral pale spots; fibrils present or absent on gill 6 . . . . . . . . . . . . . . . . . . . 3
3. Background color of abdominal terga distinctly white, tergum 8 almost entirely white with just a small pair of small dark spots anteriolaterally and distinctly different from tergum 7; gill trachea inconspicuous; gill 6 lacing fibrils; 2-3 setae at base of mandibular incisors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nixe inconspicua
Background color of abdominal terga cream to pale brown, tergum 8 with distinct color pattern and similar to tergum 7; gill trachea conspicuous; gill 6 with or without fibrils; 3-5 setae at base of mandibular incisors . . . . . . . . . . . . . . . . . . . . . . . . Nixe lucidipennis
Key to Ohio Nixe Nymph Species
