Hypertext Webster Gateway: "underwing"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Underwing \Un"der*wing`\, n.
1. (Zo["o]l.) One of the posterior wings of an insect.
2. (Zo["o]l.) Any one of numerous species of noctuid moths
belonging to {Catocala} and allied genera, in which the
hind wings are banded with red and black or other
conspicuous colors. Many of the species are called {red
underwing}.
From WordNet (r) 1.7 (wn)
underwing
n : moth having dull forewings and brightly colored hind wings
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