Review of species of the genus <i>Cercyon </i>Leach, 1817 of Russia and adjacent regions. V. Subgenus <i>Cercyon </i>Leach, 1817. <i>Cercyon nigriceps-</i>group (Coleoptera: Hydrophilidae)
Morphological diagnoses, distribution and environmental preferences of species of the Cercyon nigriceps-group (subgenus Cercyon Leach, 1817) from Russia and adjacent regions are presented. Cercyon paranigriceps sp. nov. from the Russian Far East and Myanmar is described. Cercyon nigriceps (Marsham, 1802) is recorded from Malta, Ukraine, Gambia and Nepal for the first time; C. setiger Wu & Pu, 1995 is for the first time recorded from Guizhou (China).