An Imperial moth.
imperial moth definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a large American moth (Eacles imperialis) having yellow wings with purple markings
imperial moth definition by American Heritage Dictionary
A large New World moth (Eacles imperialis) having yellow wings with purplish or brownish markings.