The Collaborative International Dictionary of English v.0.48:

Rutilian \Ru*til"i*an\ (r[.u]*t[i^]l"[i^]*an), n. (Zool.)
   Any species of lamellicorn beetles belonging to Rutila and
   allied genera, as the spotted grapevine beetle (Pelidnota
   punctata).
   [1913 Webster]