A new species of bee fly of the genus Chrysanthrax Osten Sacken, C. pennyi, n. sp., is described and illustrated. It was reared from the larva of a myrmeleontid, which marks the first record of parasitism by the genus of that family. The pupal exuvium is described and illustrated and a key to species known from Central America is given.
Keywords: Neuroptera, parasitism, Anthracinae, ant lion, bee fly, taxonomy.