Because of the number of species that are not identified as nymphs and the difficulties in identifying the characters, it is recommended not to attempt identification below the level of genus.
1. Abdominal tergites clothed with erect hairs throughout . . . . . Allocapnia illinoensis
Erect hairs not evenly distributed, but more abundant near posterior margin and sometimes at midlength of tergites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Abdominal tergites bearing, in addition to the prostrate clothing hairs, termina and intermediate rows of erect hairs (as seen in side view). . . . . . . . . . . . . . . . . . . . . . 6
Abdominal tergites bearing, in addition to the prostrate clothing hairs, only a terminal row of erect hairs (as seen in side view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Galea with a wide fringe of setae on the outer surface . . . . . . . . . . . . . . . . . . . . . . 4
Galea with a narrower fringe, usually with fewer than 10 hairs. . . . . . . . . . . . . . . . 5
4. Longest hairs in fringe of galea shorter than the width of the galea at the point of insertion; clothing hairs numerous; supraanal love of mature male nymph long; species common and widespread . . . . . . . . . . . . . . . . . . . . . Allocapnia pygmaea
Longest hairs in fringe of galea longer than the width of the gales; clothing hairs much fewer, inconspsicuous; supraanal lobe of mature male nymph short. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Allocapnia pechumani
5. Terminal abdominal tergites with intermediate erect hairs only on the lateral margins; supraanal lobe of mature male nymph long. . . . . . . . . . . . . . . .Allocapnia nivicola
Terminal abdominal tergites with intermediate erect hairs on the lateral thirds of the tergite; as none occur on the middle third of the segment, none are seen in the side view of the abdomen; supraanallobe of mature male nymph short . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Allocapnia recta
6. Erect bristles on margin of tergites long, about half as long as mid-dorsal tergite length; intermediate bristles few; species of moderate size (6-8 mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Allocapnia rickeri
Erect bristles on margin of tergites short, about one-third as long as middorsal tergite; intermediate bristles numberous; large species (8-10) mm. . . . . . . . . . . . . 7
7. Head and pronotum hairy in side view; mature male nymph without wing-pads; supraanal lobe of mature male nymph, twice as long as 10th abdominal segment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Allocapnia vivipara
Head and pronotum with fewer hairs; mature male nymph with short wing-pads; supraanal lobe of mature male nymph short, about as long as 10th tergite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Allocapnia granulata
The following species that are found in Ohio are not included in the above key: Allocapnia forbesi, A. frisoni, A. indianae, A. mystica, A. ohioensis, A. smithi, A. zola. Use keys to the adult form or barcoding to place species.
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Key to the Species of Ohio Allocapnia Nymphs