Prunella immaculata -- Maroon-backed Accentor. Alternate name on piece: Accentor immaculatus [Blue-shouldered accentor] Layout drawing, birds very finished; marginal sketches of foliage details, and of 3 unrelated birds; "Immaculatus / 2 specimens"; money calculation. Artist's name(s): Gould, John; Richter, Henry Constantine.