Amazilia violiceps -- Colibrí corona violeta, Violet-crowned Hummingbird. Alternate name on piece: Cyanomyia violiceps [Curtis] 5-4417. Title in pencil by Sotheran, bookseller. Artist's name(s): Gould, John; Richter, Henry Constantine. Gould's sketch, tightened by Richter and colored to give general effect.