Petrov P.N.1, Shapovalov M.I.2, Fery H.3 2010. A new species of Ilybius Erichson, 1832 (Coleoptera: Dytiscidae) from the North Caucasus // Russian Entomol. J. Vol.19. No.1: 41–45 [in English].
1 Ul. Profsoyuznaya 115-2-451, 117647 Moscow, Russia. E-mail: firstname.lastname@example.org
2 Laboratory for Bioecological Monitoring of the Invertebrates of the Republic of Adygeya, Adyghe State University, ul. Pervomayskaya 208, Maykop, 385000 Republic of Adygeya, Russia. E-mail: email@example.com
3 Räuschstr. 73, 13509 Berlin, Germany. E-mail: firstname.lastname@example.org
KEY WORDS: Coleoptera, Dytiscidae, Ilybius chalconatus-group, new species, Russia, Caucasus.
ABSTRACT. A new species of Dytiscidae, Ilybius adygheanus sp.n., is described from the North Caucasus, Russia. It is assigned to the Ilybius chalconatus-subgroup, within the species group of the same name, although it lacks the anterodorsal spiniferous punctures on the first four metatarsomeres, characteristic of most individuals of the species belonging to this subgroup. The members of this species group were before Nilsson  treated in the genus Agabus Leach, 1817. The key to species for males of the chalconatus- and erichsoni-groups in Fery & Nilsson  is modified in part to include the new species.