Nymphaea amazonum Mart. & Zucc. a nocturnally flowering species, is visited by the scarab beetleCyclocephala mollis Endrödi in the Pantanal region of Mato Grosso, Brazil. Beetles were found in all flowers examined and some remain in the flowers during the day. The beetles are dusted with pollen in second-day flowers and carry it to first-day flowers which have receptive stigmas.