Monograph of the Trochilidae, or family of hummingbirds: Part IV
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- Hoary Puffleg plate 281
- Plate depicting: Haplophaedia lugens (Gould, 1851) -- Hoary Puffleg. Alternate name, as printed: Eriocnemis squamata
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- Sapphire-vented Puffleg plate 282
- Plate depicting: Eriocnemis luciani (Bourcier, 1847) -- Sapphire-vented Puffleg. Alternate name, as printed: Eriocnemis lugens