Colibri thalassinus  cyanotus -- Green Violet-ear, Green Violetear, Colibrí oreja violeta. Alternate name on piece: Petesophora cyanotis Layout drawing, birds adequately finished for a preliminary stage, color added--unappealing muddy background wash (probably changed color over the years); detail sketches of flower in margins; "15/-" Sotheran's price at foot. Title in pencil by Sotheran, bookseller. Artist's name(s): Gould, John; Richter, Henry Constantine.