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Pl. XVI.
Andre & Sleigh, Ltd.
heads of: (1) (2) female grouse; (3) (4) male grouse; (5) ptarmigan, showing supra-orbital combs.
Pl. XVI.
heads of: (1) (2) female grouse; (3) (4) male grouse; (5) ptarmigan, showing supra-orbital combs.