Monograph of the Trogonidae, or family of trogons
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- Slaty-tailed trogon; Trogón cola oscura plate 36
- Plate depicting: Trogon massena (Gould, 1838) -- Slaty-tailed trogon; Trogón cola oscura. Alternate name, as printed: Hapaloderma constantia
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- Black-headed trogon; Trogón cabeza negra plate 37
- Plate depicting: Trogon melanocephalus (Gould, 1836) -- Black-headed trogon; Trogón cabeza negra. Alternate name, as printed: Harpactes diardi
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- Black-tailed trogon plate 38
- Plate depicting: Trogon melanurus (Swainson, 1838) -- Black-tailed trogon. Alternate name, as printed: Harpactes kasumba