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Adonis Blue Polyommatus bellargus Wingspan 32mm. A classic chalk downland butterfly, males of which are dazzling. Adult male has iridescent blue upperwings with black and white margins; female’s upperwings are brown with orange submarginal spots. Underwings of both sexes are grey-brown with spots. Double brooded: flies May–June and July–August. Larva feeds on Horseshoe Vetch; can sometimes be found in short turf being attended by ants. Very local in southern England but entirely restricted to chalk downs.