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]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]