Abstract
Female butterflies of Ornithoptera pria;nus urvilijana Guerin-Meneville, bred from pupae imported from Bougainville, were released in a garden at Sogeri, Papua New Guinea (9°25'S, 147°25'E) where O.p,. poseidon Doubleday occurred in all its stages naturally. This resulted in many hybrids of both sexes. Later, in the same garden, adults of both sexes of Troides oblongomaculatus papuensis Wallace, obtained from pupae introduced from Lae (6°44'S, 147°00'E) were also released and after a small colony of this species had established itself several matings of both sexes of O.p. poseidon and T. oblongomaculatus Papuensis were observed and subsequently one male hybrid specimen was reared.
