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Clouded Yellow - Colias croceus. Male (top) - female (bottom). Wingspan 50mm. A fast-flying migrant visitor to Britain, from mainland Europe. Adult has dark-bordered upperwings that are rich orange-yellow in male, pale yellow in female. Both sexes have yellow underwings with a few dark markings. Larva is green with pale yellow lateral line; feeds on Lucerne and other members of the pea family. A summer visitor to Britain, seen mainly in coastal areas; generally scarce but common in some years.