Redescription of two little-known species of Chilean Tachinidae is given in this papero The long-Iost species Chaetodemoticus chilensis (Schiner) is redescribed on specimens which are the first to be studied since Schiner described the species in 1868. A full sinonymy ol Vibrissomyia lineolata (Bigot) is also given, extending the geographical range of this species to Perú, Chile and Argentina. Carcelia halliana n. sp., is a new genus and species to Chile. Aeglops Aldrich (1934) is made a synonym of Ollacheryphe Townsend (1926) according to type examination.