Taxonomic history and review of the Förster genera of Platygastridae (Hymenoptera: Platygastroidea) Author Awad, Jessica 0F70AC80-70B4-4AED-BF6E-A191DF4F68BB State Museum of Natural History Stuttgart, Rosenstein 1, 70191 Stuttgart, Germany. FDACS-DPI, 1911 SW 34 St, Gainesville FL 32608, USA. jessica.awad@smns-bw.de Author Krogmann, Lars CF157CC1-326C-4BF9-A262-CBF9FF179B6E State Museum of Natural History Stuttgart, Rosenstein 1, 70191 Stuttgart, Germany. FDACS-DPI, 1911 SW 34 St, Gainesville FL 32608, USA. lars.krogmann@smns-bw.de Author Talamas, Elijah FDE12E40-BFCE-444A-AFAD-9A214A129345 elijah.talamas@fdacs.gov text European Journal of Taxonomy 2023 2023-06-15 875 1 1 46 http://dx.doi.org/10.5852/ejt.2023.875.2137 journal article 56102 10.5852/ejt.2023.875.2137 7d1475e5-5737-43a0-910d-c83a4cc6878c 2118-9773 8047251 6F308D64-2F63-454F-AF52-2F712A1DD2F5 Genus Trichacis Förster, 1856 Figs 22–23 Trichacis Förster, 1856: 108 , 115. Type species Trichacis pisis ( Walker, 1835 ) by subsequent designation by Ashmead 1893: 294 . Trichasis Förster, 1856 Thomson 1859: 78 . — Vlug 1995: 84 (misspelling). Remarks Trichacis is characterized by a tuft of setae on the mesoscutellum and a round or ovoid head (as opposed to the blocky head of Isocybus ). Species of Trichacis typically have a smooth or finely sculptured frons with transverse striation or rugulae above the toruli. Upon its description, Förster included T. didas ( Walker, 1835 ), T. pisis ( Walker, 1835 ) , and T. remulus ( Walker, 1835 ) . Trichacis pisis was designated as the type species by Ashmead (1983). The NHMW includes one female original exemplar of T. tristis , a species for which there is no known type material. We here designate this specimen (NHMW-HYM#0005319) as the neotype of Platygaster tristis Nees, 1834 .