Oe. dominicensis of St. Domingo may be distinct from the above.
Hudson, Argentine Ornithology, ii. London, 1889, p. 163.
Cat. Birds Brit. Mus. xxv. 1896, p.3.
Stejneger, Stand. N. H. iv. Boston, 1885, p. 75.
Baird, Brewer, and Ridgway, Water Birds N. Amer. ii. 1884, p. 194.