Hygrobia hermanni (Fabricius, 1775) Literature data: Cherepovo [Village] (Greń & Lubecki 2017). Notes: Rare species in Bulgaria, reported except from Cherepovo, only from Sofia (Guéorguiev 1987, Guéorguiev et al. 1998, as H. tarda (Herbst, 1779)). Dytiscidae Leach, 1815 Agabinae C. G. Thomson, 1867 Agabini C. G. Thomson, 1867 * Platambus maculatus (Linnaeus, 1758) (Plate I, 3) New data: W of Ustrem Vill., near Manastirska Reka River, 42°01.449′N 26°27.083′E, 95 m a.s.l., riverine vegetation, small swamp, 08.vi.2020, 1 ♂ (BFUS-COL000022), at light (white & UV), D. Gradinarov leg.; the same data, 42°01.451′N 26°27.064′E, 98 m a.s.l., riverside meadows, 1 ♂ (BFUS-COL000023); W of Ustrem Vill., near Manastirska Reka River, 42°01.417′N 26°27.140′E, 102 m a.s.l., riverine vegetation, small swamp, 29.vi.2022, 2 ♂♂ (BFUS- COL000024, BFUS-COL000025), 1 ♀ (BFUS-COL000026), at light (white & UV), D. Gradinarov leg.; W of Ustrem Vill., Manastirska Reka River, 42°01.404′N 26°26.962′E, 99 m a.s.l., 24.v.2023, 1 ♂ (BFUS-COL000027), 7 ♀♀ (BFUS- COL000028 – BFUS-COL000034), under submerged stones, D. Gradinarov leg.; W of Ustrem Vill., near Manastirska Reka River, 42°01.406′N 26°27.161′E, 97 m a.s.l., riverine vegetation, meadows, 21.vi.2023, 1 ♀ (BFUS-COL000035), at light (white & UV), D. Gradinarov leg. Colymbetinae Erichson, 1837 Colymbetini Erichson, 1837

Published as part of Gradinarov, Denis & Petrova, Yana, 2025, Water beetles (Insecta: Coleoptera) in Sakar Mountains, Bulgaria, pp. 74-94 in ZooNotes (Supplement) (Supplement) 17 on page 77