Length 18 inches, extent of wings 2 feet; bill along the ridge 5/4, along the gap 11/12; tarsus 17/12, middle toe 13/4.
Adult Female. Plate XLI. Fig. 3.
The plumage of the female is less developed and inferior in beauty. The feathers of the head and ruff are less elongated, the latter of a duller black. The tints of the plumage generally are lighter than in the male.