Colibri delphinae -- Brown Violet-ear, Brown Violetear. Alternate name on piece: Petasophora delphinae Layout drawing, color added, birds not highly finished; 2 detail sketches in margins; Sotheran's price "15/-" at foot. Title in pencil by Sotheran, bookseller. Artist's name(s): Gould, John; Richter, Henry Constantine.