Julia Longwing or “Julia” is a butterfly is part of the Brush-footed family of butterflies, they are the only member of its genus. It has long and narrow wings. The Julia can be considered distasteful to predators because the caterpillars they feed on are poisonous passion flowers. Learn more here: JULIA BUTTERFLY. I  saw these at the Arboretum of Flagstaff in the butterfly house.