Source : Webster's Revised Unabridged Dictionary (1913)

Fire beetle \Fire" bee`tle\ (Zo["o]l.)
   A very brilliantly luminous beetle ({Pyrophorus noctilucus}),
   one of the elaters, found in Central and South America; --
   called also {cucujo}. The name is also applied to other
   species. See {Firefly}.