The Pieries Rapper Butterfly. - The Small-white Butterfly, Pieries Rapper Is Most Common Through Out The Northern Hemisphere. The Pure-white Of The Wings With Accents Of Black Highlights Really Standout Here Against The Yellow Background With Black Streaks. You Can Clearly See The Antenna And Legs. The Caterpillar Is A Serious Concern To Farmers Of Cabbage. (Cabbage Itself Is A Member Of The Mustard Family.) Photo