*3. Hydrovatus cuspidatus (Kunze, 1818) Local references: Not reported earlier. Material: western suburb of Kaliningrad, 54.71°N, 20.40°E, 04.05.2020, 1 ex., in shallow water of artificial lake. Comments: New species for Kaliningrad Region and Eastern Baltic region. The nearest known localities for this species are in northern Poland and Denmark (Tamutis et al. 2011). The species probably extends the distribution range northwards nowadays and occurs in Kaliningrad region at northern periphery of main distributional area. The new locality is the northernmost known in Russia (Prokin 2005).

Published as part of Alekseev, Vitalii I., Drotikova, Anna M., Rozhina, Viktoria I. & Bukejs, Andris, 2021, Addenda To The Knowledge Of Beetles (Insecta: Сoleoptera) Of Kaliningrad Region (Western Russia): New Faunistic Records, pp. 13-31 in Acta Biologica Universitatis Daugavpiliensis 21 (1) on page 15, DOI: 10.5281/zenodo.10602099