Range. - South America; accidentally along the coast of the United States.
A rare and unique species with a form similar to the following, but with the coloration entirely different. About fifteen inches in length; tail long and deeply forked; bill yellow with a band of black about the middle. Whole head pure white, shading into the pearly color of the upper and under parts. A narrow band of black through the eye and over the ear coverts. A very rare species that is supposed to breed in southern South America. Given a place among North American birds on the strength of a specimen seen by Audubon off Long Island.