Species of the Subgenus Lumetus Zaitzev (Coleoptera, Hydrophilidae: Enochrus Thomson) of the Fauna of Russia and Adjacent Countries

Eleven species of the subgenus Lumetus Zaitzev, 1908 of the genus Enochrus Thomson, 1859 are recorded from Russia and adjacent countries. Enochrus ater (Kuwert, 1888) is recorded for the first time from Ukraine and Kyrgyzstan; E. bicolor (Fabricius, 1792), from Kyrgyzstan; E. fuscipennis (Thomson, 1884), from Georgia; E. segmentinotatus (Kuwert, 1888), from Ukraine. The aedeagus structure and the method of male genitalia preparation are discussed. An annotated list and a key to the species illustrated with original photographs and line drawings are provided, and the variability of the species is characterized. Placement of E. puetzi Hebauer, 1995 in the subgenus Lumetus is confirmed. A new synonymy is established: Enochrus ochropterus (Marsham, 1802) = Philhydrus ferrugineus Motschulsky, 1849, syn. n. The lectotype and paralectotype of Ph. ferrugineus are designated. The taxonomic status of E. asiaticus (Kuwert, 1893), E. calabricus (Ferro, 1976), and E. sahlbergi (Fauvel, 1887) is discussed.