The Collaborative International Dictionary of English v.0.48:

Eacles \Eacles\ n.
   a genus of moths including the imperial moth (Eacles
   imperialis).

   Syn: genus Eacles.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

imperial moth
    n 1: large American moth having yellow wings with purplish or
         brownish markings; larvae feed on e.g. maple and pine trees
         [syn: imperial moth, Eacles imperialis]