| elcp | Apically bi or trifurcate (Figs. 3C, 8B) | Not branched |
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| Coxal plate II | Reduced to an approximately “L”shaped sclerite formed by remnant lateral and anteromedian parts (Fig. 4A) | Broad or concave in posterior margin but not “L”shaped |
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| e on tarsi | Thick, conical (Fig. 4C) | Thin, setiform |
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| Tarsi I–II | Stout, about twice as long as basal width (Fig. 5A, B) | Slender, more than 3x of basal width |
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| scx | With more projections (Figs. 3E, 13 C) | With fewer projections |
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| sci in larva | Shorter than sce | Longer than sce |
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| Key to adults | of Tyroborus Oudemans | |
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