Ramphomicron microrhynchum -- Purple-backed Thornbill. Alternate name on piece: Ramphomicron microrhyncha Layout drawing, color added, birds not highly finished; note on form; marginal studies of head, tail; metallic paint used on gorgets of 2 birds; 2 black "positioning" marks. Title in pencil by Sotheran, bookseller. Artist's name(s): Gould, John; Richter, Henry Constantine.