The Collaborative International Dictionary of English v.0.48:
Lepidopteral \Lep`i*dop"ter*al\ (-t[~e]r*al), Lepidopterous \Lep`i*dop"ter*ous\ (-[u^]s), a. (Zool.) Of or pertaining to the Lepidoptera. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
lepidopterous \lepidopterous\ a. See lepidopteral. [PJC]