. Bulletin of the British Museum (Natural History). . Fig. I. Adult males of (A) Procnias tricarunculata. (B) P. averano, (C) P. alba, (D) P. nudi- collis. Colour of plumage as follows : P. tricarunculata. head white, rest of plumage chestnut brown ; P. alba and P. nudicollis, all white (bare skin of face and throat greenish in P. nudicollis) ; P. averano, top of head coffee-brown, wings black, rest of plumage very pale grey in western population, white in northeastern Brazilian population. alike. In the juvenile male, the crown passes through an intermediate sooty- black stage before it acqui
. Bulletin of the British Museum (Natural History). . Fig. I. Adult males of (A) Procnias tricarunculata. (B) P. averano, (C) P. alba, (D) P. nudi- collis. Colour of plumage as follows : P. tricarunculata. head white, rest of plumage chestnut brown ; P. alba and P. nudicollis, all white (bare skin of face and throat greenish in P. nudicollis) ; P. averano, top of head coffee-brown, wings black, rest of plumage very pale grey in western population, white in northeastern Brazilian population. alike. In the juvenile male, the crown passes through an intermediate sooty- black stage before it acquires the adult colour. In the adult female, the crown is darker than the back and the throat feathers are mainly dark. These two species are almost exactly the same size, and a httle smaller than the other two (Table i). In both species the males have two distinct kinds of call : a single short hammer- like note, and a succession of less loud, regtilarly repeated notes. P. alba and P. tricarunculata. The adult males of both species have an elongated wattle springing from the base of the upper mandible (P. tricarunculata also has two similar wattles arising from the corners of the gape) ; the throat is feathered ; there is apparently no bare patch on the femur ; and the modified tips of the outer primaries are much ahke in shape. The juvenile male does not develop a dark crown at any stage. In the adult female, the crown is the same green as the back and the throat is Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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