Histrionicus histrionicus -- Harlequin Duck; arlequin plongeur, Pato arlequín. Alternate name on piece: Histrionicus torquatus [Harlequin duck] Different pose from published plate; corrections; at foot of page a note in ink, which did not take on pastel, and of which little is legible: ". . . .Harlequin Duck in this Vol. 1." Artist's name(s): Gould, John; Richter, Henry Constantine. Very heavy pastel and watercolor rendering, probably by Gould, worked up by Richter