Faces of Calliopsis, in each case female and male. a, b, C. (Calliopsis) andreniformis Smith; c, d, C. (Ceroliopoeum) laeta (Vachal); e, f, C. (Leiopoeodes) xenopous Ruz. Clear areas are white or yellow. From Ruz, 1991. (source: Michener, 2007)