Borkent, A.: A world catalogue of fossil and extant Corethrellidae and Chaoboridae (Diptera), with a listing of references to keys, bionomic information and descriptions of each known life stage. Ent. scand. 24: 1-24. Copenhagen, Denmark. April 1993. ISSN 0013-8711. A world list of species of fossil and extant Corethrellidae and Chaoboridae provides a catalogue of all valid names and their synonyms, original author, type-locality, type status and depository, distribution and the citation of authors who give the latest descriptions of the male adult, female adult, pupal, larval and egg stage. References to the most recent keys, descriptions, and bionomic information for each genus are also listed. A synopsis is given of the current state of systematic progress in each family. Nomenclatorial problems are also discussed. Sayomyia lanei Belkin, Heinemann & Page is a new junior synonym of Chaoborus braziliensis (Theobald), and Chaoborus annulatus Cook is recognized as a new junior synonym of C. festivus Dyar & Shannon. Corethrella kerrvillensis (Stone), Corethrella manaosensis (Lane & Cerqueira), and Chaoborus boliviensis (Lane & Heredia) are recognized as new combinations.