silverspot

from WordNet (r) 3.0 (2006)

silverspot
    n 1: butterfly with silver spots on the underside of the hind
         wings

from The Collaborative International Dictionary of English v.0.48

Silverspot \Sil"ver*spot`\, n. (Zool.)
   Any one of numerous species of butterflies of the genus
   {Argynnis} and allied genera, having silvery spots on the
   under side of the wings. See Illust. under {Aphrodite}.
   [1913 Webster]