The first record of the parasitic myrmecophilous caterpillar (Lepidoptera, Lycaenidae) inside Asian weaver ant () nests in oil palm plantations.

Asian weaver ants () are an important biocontrol agent in agricultural habitats. We conducted surveys in oil palm plantations in Riau, Indonesia for an obligate myrmecophilous butterfly larvae, (Lepidoptera, Lycaenidae), that is known to consume weaver ant larvae in other habitat types. We found larvae in five of the twenty nests surveyed, with larval presence not being related to weaver ant nest size. We also observed larvae in a weaver ant mass rearing facility. This is the first report of from oil palm plantations and may have implications for the use of weaver ants as biological control agents.