Ptilinopus insolitus -- Knob-billed Fruit Dove. Alternate name on piece: Aedirhinus insolitus [Knob-billed fruit pigeon] Very finished painting; several erased notes; at head of sheet: six lines of notes on source and literature, all incorporated in the published text; at foot of sheet: "Go on with this / J.G." Artist's name(s): Gould, John; Hart, William Matthew.