Anthus trivialis -- Brown Tree-Pipit; Tree Pipit. Alternate name on piece: Anthus arboreus [Tree-pipit] Very finished painting; preliminary sketches of both birds pinned on in margins; 2 notes on form; "White poplar / populus albus / Britain / 24th April 65." Title in pencil by Sotheran, bookseller. Artist's name(s): Gould, John; Richter, Henry Constantine.