Amazilia violiceps -- Colibrí­ corona violeta, Violet-crowned Hummingbird. Alternate name on piece: Cyanomyia quadricolor. Layout drawing, birds well finished; corrections in more than one hand; detail sketch of head in one margin; [Curtis] 73-4299. Title in pencil by Sotheran, bookseller. Artist's name(s): Gould, John; Richter, Henry Constantine.