underwing

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underwing

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Wikispecies has information on:

Catocala

Wikispecies

under +‎ wing

underwing (plural underwings)

A hind wing on an insect.
- 1922 October 26, Virginia Woolf, chapter 2, in Jacob’s Room, Richmond, London: […] Leonard & Virginia Woolf at the Hogarth Press, →OCLC; republished London: The Hogarth Press, 1960, →OCLC:
  The upper wings of the moth which Jacob held were undoubtedly marked with kidney-shaped spots of a fulvous hue. But there was no crescent upon the underwing.
A member of the genus Catocala, a nocturnal moth which usually has brightly coloured underwings.
(ornithology) The underside of a bird's wing.