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Fery, H. & Nilsson, A. N.: A revision of the Agabus chalconatus- and erichsoni-groups (Coleoptera: Dytiscidae), with a proposed phylogeny. Ent. scand. 24: 79-108. Copenhagen, Denmark. April 1993. ISSN 0013-8711. The Holarctic chalconatus- and erichsoni-groups, with 19 and three species respectively, are revised. The following seven new species are described: Agabus balkei from Siberia, Agabus jaechi from Turkey, Agabus larsoni from Canada, Agabus lenkoranensis from Azerbaijan, Agabus pederzanii from Italy, Agabus samokovi from Bulgaria, and Agabus wewalkai from Turkey. Lectotypes are designated for the following nominal species: Dytiscus chalconatus Panzer, 1796, Dytiscus nigroaeneus Marsham, 1802, Colymbetes montanus Stephens, 1828, Agabus neglectus Erichson, 1837, Agabus subtilis Erichson, 1837, Agabus gagates Aubé, 1838, Agabus altaicus Gebler, 1848, Agabus erichsoni Gemminger & Harold, 1868, Gaurodytes lutosus Crotch, 1873, Agabus fuscoaenescens Régimbart, 1877, Agabus aenescens Poppius, 1905, Agabus satunini Zaitzev, 1913, and Agabus melanocornis Zimmermann, 1915. The following new synonyms are established: Agabus altaicus Gebler, 1848 = Agabus subtilis Erichson, 1837; Agabus melanocornis Zimmermann, 1915 = Colymbetes montanus Stephens, 1828; Gaurodytes bulgaricus Csiki, 1943 = Dytiscus conspersus Marsham, 1802; Agabus skiathos Hinterseher, 1981 = Agabus pseudoneglectus Franciscolo, 1972; and Agabus maestroae Fresneda & Hernando, 1987 = Agabus albarracinensis Fery, 1986. Agabus aenescens Poppius, 1905, and A. satunini Zaitzev, 1913, are recognized as valid species (sp. rev.). The chalconatus-group is divided into four subgroups and the phylogeny of the group is reconstructed. The relationships of the chalconatus- and erichsoni-groups with other Agabus species-groups and with Ilybius Erichson are discussed.