Blue-crowned Trogon (Trogon curucui) by John Gould Purple-breasted Trogon (Trogon variegatus)
Author: John Gould
Source: Original lithograph with later hand colour for 'A Monograph of the Trogonidae or family of Trogons' 1st edition 1836-8
URL: www.sotherans.co.uk/Prints/gould/trogons_toucans.php
Trogon variegatus Spix, 1824. "Purple-breasted Trogon": known from throughout much of range of Trogon curucui; treated as a valid species by Cory (1919); Peters (1945) considered it a color variant and a synonym of nominate Trogon curucui.