| Summary: | The Eocene Baltic amber fossil flies of the genus <i>Acartophthalmites</i> Hennig, 1965 (Diptera: Acalyptratae) are revised. Seven species are recognized and described or redescribed. Five species, <i>A. crassipes</i> sp. nov., <i>A. luridus</i> sp. nov., <i>A. rugosus</i> sp. nov., <i>A. tertiaria</i> Hennig, 1965 (type species) and <i>A. willii</i> Pérez-de la Fuente, Hoffeins et Roháček, 2018 are retained in <i>Acartophthalmites</i> while <i>Clusiomites</i> gen. nov. is described for two other species, <i>C. clusioides</i> (Roháček, 2016) comb. nov. (type species) and <i>C. ornatus</i> sp. nov. Relationships of these fossil taxa are discussed and, because they cannot be confidently placed in any known family of Diptera, a new family, Clusiomitidae, is established for them. Clusiomitidae is recognized as a family of Opomyzoidea, probably most closely allied to Clusiidae. These results again confirmed that the diversity of acalyptrate flies was very high in the Mid-late Eocene amber forest.
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