Review of Ameletidae (Ephemeroptera) of Russia and adjacent lands
Revised generic diagnoses of <i>Metreletus </i>and <i>Ameletus </i>are given. The species, originally described as <i>Ameletus micus, </i>is transferred to genus <i>Metreletus. </i>Basing on all stages of development, there are described a new species <i>Ameletus altaicus </i>sp.n., as well as new subspecies A. <i>montanus rossicus </i>ssp.n. and <i>A. montanus arlecchino </i>ssp.n., which inhabit in Siberia and Russian Far East. Brief characteristics of other species and subspecies, distributed on territory of Russia, are given. Characters of larval genital buds as such, are used in taxa diagnoses for the first time.