Citrus Swallowtail Butterfly Pair [Papilio demodocus]Papilio demodocus pair mounted an on watercolor flower reproduction. Flowers printed on watercolor paper for added texture and visual feel. 8X10 inch frame. Papilio demodocus, the citrus swallowtail or Christmas butterfly, is a large swallowtail butterfly common to Sub Saharan Africa. The caterpillars feed on the leaves of citrus trees, giving them one of their species nicknames.