Riparia riparia -- Sand Martin; Bank Swallow, Golondrina ribereña, hirondelle de rivage Riparia. Alternate name on piece: Cotyle riparia [Sand-martin] Layout drawing, bird very finished; 2 notes, on form and color; detail sketch of bill; non-relevant lettering trials in margin. Title in pencil by Sotheran, bookseller. Artist's name(s): Gould, John; Richter, Henry Constantine.