1. Mid-dorsal stripe absent or incomplete (Fig. 2.2.1.1) . . . . . . . . . . . . . . . . . . . . . . . 2
Mid-dorsal stripe continuous (Fig. 2.2.1.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Mid-dorsal stripe most distinct on abdomen; thorax and pronotum concolorous or with pale markings; area adjacent to eyes as dark as rest of head. . . . . . . T. lita (in part)
Mid-dorsal stripe broken throughout its length, weak or entirely absent on abdomen; area adjacent to eyes paler than rest of head . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Dorsum uniformly dark; pronotum totally dark; bristles on abdominal tergites long and curled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. parvula
Dorsum with light dots on posterior margins of abdominal tergites in many individuals; lateral margins of pronotum yellow; bristles on abdominal tergites sort and blunt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. nivalis
4. Pigmentation darkest along border of mid-dorsal stripe, either throughout its length, or on thorax only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pigmentation along border of mid-dorsal stripe as dark as rest of nymph . . . . . . . . 7
5. Pale area between eyes wider than pronotal portion of mid-dorsal stripe; muscle scars evident; broad pale ring around each eye (Fig.2.2.1.3) . . . . . . .T. metequi (in part)
Pale area between eyes and pronotal portion of mid-dorsal stripe of same width; usually no muscle scars visible; pale ring around eyes narrow or absent . . . . . . . . 6
6. Developing femoral spur in mature male nymphs visible under exoskeleton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. maura
No femoral spur visible under exoskeleton, at most a raised swelling occurs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. burksi
7. Head portion of mid-dorsal stripe wider than pronotal portion, with muscle scars visible; broad pale ring around each eye (Fig.2.2.1.3) . . . . . . . . T. metequi (in part)
Head portion of mid-dorsal stripe of same width or narrower than pronotal portion; pale ring round eyes narrow or absent . . . . . . . . . . . . . . . . . . . . . . T. lita (in part)
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Key to the Species of Ohio Taeniopteryx Nymphs
(Modified from Poulton & Stewart, 1991, and Hitchcock, 1974)
