Contributions to the knowledge of beetles (Insecta: Coleoptera) in the Kaliningrad region. 2 Author Alekseev, Vitaly I. Author Bukejs, Andris text Baltic Journal of Coleopterology 2011 11 2 209 231 journal article 10.5281/zenodo.13204407 1407-8619 13204407 5. CERCYON CASTANEIPENNIS VORST , 2009 * Examined material: 1 km NE Chernyakhovsk , 54°64´57´´N 21°84´68.5´´E, 8.VI.1993 (2 exx, pasture, cattle excrements, leg. V .Alekseev); the Curonian Spit , 1 km W Morskoe , 55°23´44´´N 20°90´44´´E, 8.V.1997 (2 exx, Baltic sea shore, coastal refuse of the beach, leg. V . Alekseev) . Comments: After description of this new species ( Vorst 2009 ) and division of Cercyon obsoletus (Gyllenhal, 1808) [= C. lugubre Olivier 1790 ] in two separate species, all the earlier published data need to be redeterminated or confirmed. In the Baltic region C. castanipennis s.str. is mentioned for Sweden , north-eastern Poland and Latvia ( Vorst 2009 ); it is known also from Central Russia ( Prokin 2010 ). Formally, C. castanipennis is new for the fauna of the Kaliningrad region . In accord to our collections, the coprophilous species prefers more dry and sandy habitats (valleys of rivers and sea coasts) in comparison with closely related C. obsoletus . Future investigations of bionomics, features of distribution and phenology of both Cercyon species are required in the region.