Versicoloured Barbet (top row) - Lemon-throated Barbet (center/bottom left) - Red-headed Barbet (center/bottom right)
<bdi><a href="https://en.wikipedia.org/wiki/en:John_Gerrard_Keulemans" class="extiw" title="w:en:John Gerrard Keulemans"><span title="Dutch bird artist (1842-1912)">John Gerrard Keulemans</span></a>
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<i><a href="//commons.wikimedia.org/wiki/Catalogue_of_the_birds_in_the_British_Museum" title="Catalogue of the birds in the British Museum">Catalogue of the birds in the British Museum</a></i> (<a rel="nofollow" class="external text" href="https://archive.org/details/catalogueofbirds19brit">Vol. 19</a> Plate V)