*5. Hydrochus ignicollis Motschulsky, 1860

Local references: Not reported earlier.

Material: Baltiisk district, Mechnikovo vicinity, 54.67°N, 19.91°E, 16.06.2021, 1 ex., sandy coast of the Baltic Sea .

Comments: Hydrochus ignicollis has been known as synonym of Hydrochus elongatus (Schaller, 1783) for a long time and this species was absent in the lists of beetles of Kaliningrad region (e.g. in Alekseev 2010a) or of the former East Prussia [Bercio & Folwaczny 1979). This is the first formal report of the species from Kaliningrad region. The species is probably native species with unknown distribution in Kaliningrad region.