* Sphaeridium bipustulatum Fabricius, 1781 (Plate III, 35) New data: W of Ustrem Vill., 42°01.385′N 26°27.188′E, 96 m a.s.l., riverside meadows, 14.ix.2025, 5 ♂♂ (BFUS- COL000360 – BFUS-COL000364), 1 ♀ (BFUS- COL000365), in horse dung, D. Gradinarov & Y. Petrova leg.
Staphylinoidea Latreille, 1802 Hydraenidae Mulsant, 1844 Ochthebiinae Thomson, 1859
* Ochthebius (Ochthebius) lividipennis Peyron, 1858 (Plate IV, 36, 37)
New data: W of Ustrem Vill., near Manastirska Reka River, 42°01.448′N 26°27.022′E, 98 m a.s.l., riverside meadows, 23.vii.2021, 1 sex indet. (BFUS-COL000366), at light (UV), D. Gradinarov leg.; Ustrem Vill., about 150 m from Manastirska Reka River, 42°01.332′N 26°27.381′E, 100 m a.s.l., house yard, 04.ix.2021, 4 ♂♂ (BFUS- COL000367 – BFUS-COL000370), 12 ♀♀ (BFUS-COL000371 – BFUS-COL000382), at light (white & UV), D. Gradinarov & Y. Petrova leg.
* Ochthebius (Ochthebius) viridis viridis Peyron, 1858 (Plate IV, 38, 39)
New data: W of Ustrem Vill., near Manastirska Reka River, 42°01.448′N 26°27.022′E, 98 m a.s.l., riverside meadows, 23.vii.2021, 3 ♂♂ (BFUS- COL000383 – BFUS-COL000385), 6 ♀♀ (BFUS- COL000386 – BFUS-COL000391), 16 sex indet. (BFUS-COL000392 – BFUS-COL000407), at light (UV), D. Gradinarov leg.; Ustrem Vill., about 150 m from Manastirska Reka River, 42°01.332′N 26°27.381′E, 100 m a.s.l., house yard, 04.ix.2021, 2 ♂♂ (BFUS- COL000408, BFUS-COL000409), 2 ♀♀ (BFUS- COL000410, BFUS-COL000411), at light (white & UV), D. Gradinarov & Y. Petrova leg.
Notes: The species is firstly reported from Bulgaria by Netolitzky (1912) with locality Trnovo [= Veliko Tarnovo] (as Ochthebius viridis). The species is listed for Bulgaria in the first edition of the Catalogue of Palaearctic Coleoptera (Jäch 2004), but according to Jäch & Delgado (2008), the presence of the species in Bulgaria needs confirmation. Bulgaria is excluded from the distributional list of the species in the second edition of the Catalogue (Jäch & Skale 2015). Herein we confirm the presence of the species in Bulgaria.
Byrrhoidea Latreille, 1804 Elmidae Curtis, 1830 Elminae Curtis, 1830 Elmini Curtis, 1830 Elmina Curtis, 1830