British Wildlife Wiki
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The Mazarine Blue (Cyaniris semiargus) is a species of butterfly in the Lycaenidae family.

Once common in southern England, with hundreds of records each year, this species is now extinct. The males re a bright blue, and the females are a dull brown, but quite a light brown. The underside is a light brown with a row of dots and an "lunar" mark on each wing.

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