Monograph of the Trogonidae, or family of trogons

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Crested quetzal plate 15
Crested quetzal plate 15
Plate depicting: Pharomachrus antisianus (Orbigny, 1837) -- Crested quetzal. Alternate name, as printed: Trogon atricollis
Golden-headed quetzal plate 16
Golden-headed quetzal plate 16
Plate depicting: Pharomachrus auriceps (Gould, 1842) -- Golden-headed quetzal. Alternate name, as printed: Trogon tenellus
Golden-headed quetzal plate 17
Golden-headed quetzal plate 17
Plate depicting: Pharomachrus auriceps (Gould, 1842) -- Golden-headed quetzal. Alternate name, as printed: Trogon caligatus