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Horaga onyx (Moore 1857) commonly known as Common Onyx or Blue Onyx is one of the rarest Lycaenid butterfly species found in Sri Lanka. Only a handful of sight records are there of this butterfly and much of the biology of this butterfly in Sri Lanka has not been studied. Here we report the first record of this species ovipositing in Sri Lanka and first record of its host plant, Macaranga indica.
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