Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

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