Black swallowtail (pupilio polyxenes) Wingspan: 2.5″-4″ Host plant in my yard dill, dennel, common rue, parsley. In this pic she us kaying eggs on a hge stand of volunteer dill in my yard. This pic is not not sharp. Sun was directly over head and she was constantly beating her sings. I could not zero in on her. They always seem to lay eggs very early or at the hottest time of the day.