Hellgrammites, the pincered larvae of the dobsonfly, grow more than 3 inches long and are a favorite food of bass and big trout.    From Wordnik.com.  [More Fishing Tips] Reference

Sprouse will tie his own "Mike's Hellgrammite," which imitates the aquatic larva of the dobsonfly, as well as his version of the Clouser minnow.    From Wordnik.com.  [CITIZEN-TIMES.com - News] Reference