A world review of the bee fly tribe Usiini (Diptera, Bombyliidae) - Part 3: Parageron Paramonov s. lat. Author Gibbs, David 6DF4A27A-C5CA-4D2E-A910-4B5C373306B2 Orchard Cottage, Cecil Road, Weston-super-Mare, UK BS 23 2 NF. davidjgibbs6@Sky.com text European Journal of Taxonomy 2023 2023-03-24 863 1 1 162 http://zoobank.org/10981377-cce7-4487-a415-4e409e55a507 journal article 10.5852/ejt.2023.863.2081 59ed2548-4c91-4485-ae44-08609e1028bb 2118-9773 7767958 10981377-CCE7-4487-A415-4E409E55A507 Key to genera of Parageron s. lat. 1. Either a distinct additional crossvein between veins R 2+3 and R 4 or discrete round or oval brown to shiny black spots on either side of the mesonotum on the thoracic suture ( Gibbs 2011 ) (can be small and inconspicuous in some pale yellow species, do not confuse with brown spot behind thoracic suture above wing base in some species). Gonostyli with distinct thumb-like lobe on inner side. Genital fork largely membranous, usually only arms clearly sclerotized ......................................... 2 – Venation normal, no R 2+3 –R 4 crossvein, mesonotum variously patterned or uniformly dusted, never with discrete dark spots on thoracic suture. Gonostyli very variable, usually sigmoid, curved with basal boss, hooked or with small apical projections. Genital fork usually well sclerotized centrally, at least a sclerotized arch connecting arms of genital fork present .................................................. 3 2. An extra crossvein between veins R 2+3 and R 4, all crossveins shaded brown ..... Ectopusia gen. nov. One species E. additivaneura gen. et comb. nov. ( Carles-Tolrá, 2009 ) – No crossvein in this position, wing membrane adjacent to crossveins entirely hyaline ..................... ............................................................................................................... Parageron Paramonov, 1929 3. At least front knees marked with yellow and/or, if legs entirely black, dusted genal area between eye and undusted mouth margin conspicuously broader than the palp at its broadest. Male genitalia often small, contracted into apical tergites, if relatively large, then tibia yellow ....... Protypusia gen. nov. – Legs entirely black and dusted genal area between eye and undusted mouth margin, approximately at level of palp, very narrow, not wider than tip of palp at its broadest. Male genitalia relatively large, about a third to half as large as rest of abdomen .................................................... Parusia gen. nov.