European Journal of Taxonomy 13: 1-62 ISSN 2118-9773 http://dx.doi.org/10.5852/ejt.2012.13 www.europeanjournaloftaxonomy.eu 2012 · Alexandr B. Ryvkin This work is licensed under a Creative Commons Attribution 3.0 License. Monograph New species and records of Stenus (Nestus) of the canaliculatus group, with the erection of a new species group (Insecta: Coleoptera: Staphylinidae: Steninae) Alexandr B. RYVKIN Laboratory of Soil Zoology & General Entomology, Severtsov Institute of Problems of Ecology & Evolution, Russian Academy of Sciences, Leninskiy Prospect, 33, Moscow, 119071 Russia. Bureinskiy Nature Reserve, Zelyonaya 3, Chegdomyn, Khabarovsk Territory, 682030 Russia. Leninskiy Prospekt, 79, 15, Moscow, 119261 Russia. Email:
[email protected] Abstract. The canaliculatus species group of Stenus (Nestus) is redefi ned. Four new Palaearctic species of the group are described and illustrated: S. (N.) alopex sp. nov. from the Putorana Highland and Taymyr Peninsula, Russia; S. (N.) canalis sp. nov. from SE Siberia and the Russian Far East; S. (N.) canosus sp. nov. from the Narat Mt Ridge, Chinese Tien Shan; S. (N.) delitor sp. nov. from C & SE Siberia. New distributional data as well as brief analyses of old records for fourteen species described earlier are provided from both Palaearctic and Nearctic material. S. (N.) milleporus Casey, 1884 (= sectilifer Casey, 1884) is revalidated as a species propria. S. (N.) sphaerops Casey, 1884 is redescribed; its aedeagus is fi gured for the fi rst time; the aedeagus of S. (N.) caseyi Puthz, 1972 as well as aedeagi of eight previously described Palaearctic species are illustrated anew. A key for the identifi cation of all the known Palaearctic species of the group is given.