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Anthene kersteni, the Kersten's hairtail or Kersten's ciliate blue, is a butterfly of the family Lycaenidae. It is found from South Africa to Kenya, Uganda, and Ethiopia. In South Africa it is found in coastal lowland forest in KwaZulu-Natal, from the coast to Kosi Bay, inland across the Makathini Flats. The wingspan is 26–28 mm for males and 23–29 mm for females. Adults are on wing year-round, with a peak in summer. The larvae feed on Acacia species, including and and Albizia adianthifolia.