cockchafer

from WordNet (r) 3.0 (2006)

cockchafer
    n 1: any of various large European beetles destructive to
         vegetation as both larvae and adult [syn: {cockchafer},
         {May bug}, {May beetle}, {Melolontha melolontha}]

from The Collaborative International Dictionary of English v.0.48

Cockchafer \Cock"chaf`er\, n. [See {Chafer} the beetle.] (Zool.)
   A beetle of the genus {Melolontha} (esp. {Melolontha
   vulgaris}) and allied genera; -- called also {May bug},
   {chafer}, or {dorbeetle}.
   [1913 Webster] Cockcrow