Contributions to the knowledge ofStenus (Nestus) species of thecrassus group (Insecta: Coleoptera: Staphylinidae: Steninae) 1. Four new species from the Russian Far East with taxonomic notes

The subgenus Nestus Rey, 1884 of the genus Stenus Latreille, 1797 is revalidated. The crassus species group is reestablished. Four new Stenus (Nestus) species are described from the Russian Far East: S. (N.) finalis sp.n. from Sakhalin, Kuriles, the Khabarovsk Territory, and Maritime Province; S. (N.) pardulus sp.n. from the S Maritime Province; S. (N.) finitor sp.n. and S. (N.) minus sp.n., both from the NE Amur Area. Stenus (N.) subcautus Ryvkin, 2000 is transferred from the cautus group to the crassus group and reported from the Amur Area for the first time.