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 <i>Cercyon nigriceps</i>-group (subgenus <i>Cercyon </i>Leach, 1817) from Russia and adjacent regions are presented. <i>Cercyon paranigriceps </i>sp. nov. from the Russian Far East and Myanmar is described. <i>Cercyon nigriceps </i>(Marsham, 1802) is recorded from Malta, Ukraine, Gambia and Nepal for the first time; <i>C. setiger </i>Wu & Pu, 1995 is for the first time recorded from Guizhou (China).