Limenitis astyanax

from WordNet (r) 3.0 (2006)

Limenitis astyanax
    n 1: similar to the banded purple but with red spots on
         underwing surfaces [syn: {red-spotted purple}, {Limenitis
         astyanax}]

from The Collaborative International Dictionary of English v.0.48

Ursula \Ur"su*la\, n. (Zool.)
   A beautiful North American butterfly ({Basilarchia astyanax}
   syn. {Limenitis astyanax}). Its wings are nearly black with
   red and blue spots and blotches. Called also {red-spotted
   purple}.
   [1913 Webster]