Key to the species of fossil Lonchodryinus (♀) 1 Head with OPL more than 3 × as long as POL; 2r-rs&Rs vein with distal part (Rs) more than twice as long as proximal part (2r-rs) and with curve more pronounced (Fig. 3)................................... L. balticus Olmi & Guglielmino – Head with OPL less than 2 × as long as POL (Fig. 1); 2r-rs&Rs vein with distal part (Rs) less than twice as long as proximal part (2r-rs) and with curve less pronounced (Fig. 1)............................................ L. groehni sp. nov.

Published as part of Olmi, Massimo, Vasilenko, Dmitry V., Capradossi, Leonardo, Perkovsky, Evgeny E. & Guglielmino, Adalgisa, 2021, A new species of Lonchodryinus (Hymenoptera, Dryinidae) from Upper Eocene Baltic amber, pp. 328-336 in Zootaxa 5020 (2) on page 333, DOI: 10.11646/zootaxa.5020.2.5, http://zenodo.org/record/5223346