These species form two genera-Sarco ramphus and cathartes.
"The Boy Hunters"
Captain Mayne Reid
He is, more probably, a distinct species of cathartes; for, although he resembles the turkey-buzzard in shape and size, his plumage appears to me of a purer black, and the skin of his head, neck, and legs, of a much more vivid red-having an appearance as if these parts had been painted.
"The Boy Hunters"
Captain Mayne Reid
I think naturalists will yet discover, that besides the great Californian vulture, there are three if not four species of the smaller cathartes."
"The Boy Hunters"
Captain Mayne Reid