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(invertebrate zoology)
Either of a pair of posterior wings on certain insects, as the moth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the general name for moths of the closely related genera Catocala, Mormonia, and Ephesia. The wing-spread is 6–12 cm. The hind wings are brightly colored, with black stripes. Common underwings include Catocala fraxini, C. nupta, and Ephesia fulminea. The moths are distributed mainly in the forest zones of Eurasia and America. The caterpillars feed on the leaves of trees and shrubs, especially plants of the families Salicaceae (willows), Fagaceae (beeches), and Rosaceae (roses).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Still, knowing which ducks have light bellies and white underwings can be important, because you are often looking at the undersides of incoming ducks.
STAGE FRIGHT: Martin Fraser was playing with his band Underwings.
And in a grouping near the patch's center are three underwings (Catacola spp.).
She kindles to a new kind of bird: while the eastern flicker is a yellow-shafted race, the western, her first spotting, is red-shafted--"the wonder of their underwings."
Their white underwings and white feathers on the outside of their tails are striking.
It has a dark brown body and only sprinkles of white on the underwings and tail.
Ironically, the underwings merely give the impression of being green.
You'll see a graceful bird gliding by with its kite-shaped wings and orange underwings. Last spring was my first time seeing a male Common Redstart, a small bird that is barely noticeable if it weren't for its bright orange underparts and black throat.
Juveniles lack the distinguishing white feathers of the adults, but are brown with varying degrees of white spots on their body, tail and underwings. Individuals reach maturity and develop the adult plumage at about five years old.
A fine August thorn with its orangey wings held upwards, and many yellow underwings, of three species, came a-visiting.
In flight they show a grey rump and white underwings and flocks can be recognised by their "chack-chack-chack" calls.
Eyed hawkmoth, lesser swallow prominent, hebrew character, riband waves, miller and scores of large yellow underwings were drawn in to the light.