The Collaborative International Dictionary of English v.0.48:

Cucujo \Cu*cu"jo\ (k??-k??"h?), n. [Native name.] (Zool.)
   The fire beetle of Mexico and the West Indies.
   [1913 Webster] Cucullate

The Collaborative International Dictionary of English v.0.48:

Fire beetle \Fire" bee`tle\ (Zool.)
   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.
   [1913 Webster]