Mother of Pearl - http://www.flickr.com/photos/qwertyqwertyqwerty/
The Mother of Pearl (Pleuroptya ruralis) is a British micro moth.
One of the largest micro moths, this common species is larger than many macro moth species. This species has a wingspan of 25-40mm. This species is common throughout Britain, and is often attracted to light. It's wings are a pearly colour, hence it's name.
The larvea feed on Nettle.
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Mother of Pearl - WWC Archives