Histrionicus histrionicus -- Harlequin Duck; arlequin plongeur, Pato arlequí­n. Alternate name on piece: Histrionicus torquatus [Harlequin duck] Layout study in charcoal, very rough Artist's name(s): Gould, John; Richter, Henry Constantine. The color added, almost certainly by Richter, covers the roughness and gives an excellent impression of the intended effect.