Troilus

from The Collaborative International Dictionary of English v.0.48

Troilus \Tro"i*lus\, n.; pl. L. {Troili}, E. {Troiluses}. [NL.,
   fr. L. Troilus, Gr. ?, the son of Priam.] (Zool.)
   A large, handsome American butterfly ({Euph[oe]ades troilus},
   or {Papilio troilus}). It is black, with yellow marginal
   spots on the front wings, and blue spots on the rear wings;
   -- also called {troilus butterfly}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Troilus butterfly \Tro"i*lus butterfly\
   A large American butterfly ({Papilio troilus}). It is black,
   with yellow marginal spots on the front wings, and blue on
   the rear; -- also called {troilus}.
   [Webster 1913 Suppl.]