DUSKY GROUS. 449 
white ; the greyish-black of the breast passes into blackish-grey, and 
finally into dull bluish-grey ; the feathers of the abdomen tipped with 
greyish-white, as are the lower rump and tail-coverts, which have more- 
over one or two narrow bars of the same; the flanks undulated with 
black and marked with an elongated white spot along the central 
part and on the tip ; axillary feathers white, as are the inner wing-co- 
verts ; the tarsal feathers brownish-grey. The concealed part of the 
plumage is light grey, unless on the feathers around the bare space on 
each side of the neck, which is of an orange colour, and which the bird 
inflates. 
Length to end of tail 22 inches, to end of wings 151, to end of claws 
183; extent of wings 30 ; wing from flexure 92; tail 74; bill along the 
ridge 1, along the edge of lower mandible 124 ; tarsus 1,;% ; hind toe;;, 
- its claw 7%; second toe 14% its claw 74; third toe 149, its claw 2% ; 
fourth toe 17, its claw £4. 
Female. Plate CCCLXI. Fig. 2. 
The female is considerably smaller than the male. The bare papil- 
lar space over the eye is of much less extent, but, as well as the bill and 
feet, is coloured asin the male. The upper parts are dark greyish-brown, 
barred on the neck with orey, on the other parts barred and minutely 
undulated with yellowish-brown ; the wings as in the male, but lighter 
_ and more mottled; the tail greyish-brown, becoming black toward the 
end, the middle feathers undulated like the back, and having four grey 
bands with a terminal white one. The sides of the head and the 
throat are greyish-white, undulatingly barred with brown ; the gene- 
ral colour of the fore neck is greyish-brown, with pale sienna bands; 
on the breast the colour is brownish-grey, and the colours and mark- 
ings of the rest of the under parts are as in the male, but paler. 
Length to end of tail 194 inches; wing from flexure 9; tail 6}; 
bill along the ridge }$. 
In a specimen in my possession, killed by Dr TownsEnp on the 
“Columbia River, Sept. 26. 1834,” the tail is considerably rounded, 
the lateral feathers being 7 twelfths shorter than the longest remain- 
ing, the middle feathers being lost. The tail is deep black, with a 
terminal band of ash-grey, half an inch in breadth. It is therefore 
probable, that when the tail is unworn, it is distinctly rounded, and 
tipped with grey. 
VOL. IV. Ff 
