Townsend & Wetmore 1919. The Birds: in Roports on the seien-tifle results of the expedition to the tropical Pacific in charge of Alexander Agassiz, on the U.S. Fish Commission Steamor "Albatross," from August,1899to March, 1900. Commander Jefferson, F. Moser,U.S.N.,Commanding No. XXI. Cambridge Mass. Bulletin of the Museum of Comparative Zoology, 63 1919: (151-225)