Prominent yellow markings in tail, 
b, Size large, back chestnut, cheeks and 
sides of throat naked* 
Gymnostinops montezuma 
bb * Size medium, back black, cheeks feathered. 
Zarhynchus waglerl 
Tail black, without yellow, 
b* Larger, wing 154-202, neck ruffed, plumage 
with violet sheen, 
Psomocolax orizivorus l 
bb. Smaller, wing 112-132, no ruff, plumage 
with greenish sheen. 
Dives dives 
