hellgrammite

from The Collaborative International Dictionary of English v.0.48

Corydalus \Corydalus\ prop. n.
   The type genus of the {Corydalidae}. It includes the
   dobsonfly ({Corydalus cornutus}), whose aquatic larva, the
   {hellgrammite}, is used as bait in fishing.

   Syn: genus {Corydalus}, genus Corydalis.
        [WordNet 1.5 +PJC]