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HeliangelusKeulemans. Heliangelus laticlavius Heliangelus amethysticollis laticlavius and Heliangelus violiceps Heliangelus amethysticollis violiceps Catalogue of the Birds in the British Museum Volume Creator John Gerrard Keulemans PDold John Gerrard Keulemans Catalogue of the Birds in the British Museum Heliangelus amethysticollis