Nigrobaetis rhithralis (Soldán Thomas, 1983) is completely redescribed at larval and imaginal stages of both sexes based on the type material. This species and the closely related Palaearctic species Nigrobaetis digitatus (Bengtsson, 1912) were compared to clarify their relationships. Several new distinguishing characters useful for separation of these two species are proposed and discussed; they may be further used to distinguish cryptic species within the genus Nigrobaetis Novikova Kluge, 1987.

Biology Centre of the Czech Academy of Sciences Institute of Entomology Branišovská 31 37005 České Budějovice Czech Republic and State Museum of Natural History National Academy of Sciences of Ukraine Teatralna 18 79008 Lviv Ukraine Branišovská 31 37005 České Budějovice Czech Republic

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Baetidae (Insecta: Ephemeroptera) of Aurès Mountains (Algeria): A New Species of the Baetis alpinus Species Group, with Notes on Baetis Laech, 1815 Biogeography within Maghreb