Citrus Swallowtail (Papilio demodocus)
(I.D. courtesy of Danny Burk)

Another tough one to expose correctly, with the dark black of the wing contrasting with the bright white/yellow color bands and spots. Canon 100-400 at 260 mm, ISO 200, f/22, 1/160 second (manual mode), 550EX Flash with Stofen Omnibounce (flash EV +2/3), Wimberley Sidekick/Arca Swiss Ballhead/Bogen-Manfrotto monopod.