THE AMERICAN MOUNTAIN-PHEASANTS. 217 
abdomen, under tail-coverts, and tips of tailfeathers white ; 
casque slate-blue ; bill and legs red. Total length, 33°5 inches ; 
wing, 14; tail, 13°2; tarsus, 4°2; middle toe and claw, 3°5. 
Adult Female.— Differs chiefly from the male in having the chin 
and throat mostly pale reddish-brown; the back and wing- 
coverts chestnut, barred with black and tipped with buff; the 
lower back reddish-brown, with indistinct black bars; the 
chest rufous, barred with black, and the breast, sides, and flanks 
rufous-buff. Size similar. 
Some females resemble the male in plumage. Mr. Dawson 
Rowley records an undoubted female in black plumage similar 
to that of the male. Further information is required on this 
subject. 
Range.-—Venezuela ; United States of Colombia ; Rio Cassi- 
quiari, and R. Orinoco ; North-eastand Central Peru. Buffon 
records this species from Cayenne. 
Mr. W. Summerhayes says that in the mountains of Vene- 
zuela this bird is common, and takes the place of Crax dauben- 
toni, which is only found along the littoral as far as the foot of 
the mountains. 
Eggs.—Broad ovals; shell white and rough. Average mea- 
surements, 3°5 by 2°5 inches. 
TIIE AMERICAN MOUNTAIN-PHEASANTS. GENUS 
OREOPHASIS. 
- Oreophasis, G. R. Gray, Gen. B. iii. p. 485 (1844). 
Type, O. derbianus, Gray. 
Width of the upper mandible greater than the height. 
An elongate, straight, rather slender, cylindrical casque or 
helmet situated on the top of the head between the eyes ; crown 
mostly naked. 
Base of the upper mandible, as far as the nostrils, densely 
covered with velvety feathers. 
