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1 Hindtibia with teeth or stout spines along posterior surface
Zanysson
1’ Hindtibia with hair and bristles only on posterior surface 2
2 Posterior margins of terga simple, not thickened or double edged 3
2’ Posterion margins of terga thickened and double edged, at least dorsally 4
3 Forewing with only two submarginal cells
Hyponysson
3’ Forewing with three submarginal cells
Nysson
4 Media of hindwing diverging at cu-a; posterior tergal margins gradually thicker toward dorsolateral edges
Synnevrus
4’ Media of hindwing diverging well beyond cu-a
Epinysson
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