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Abstract
The information available on the Chilean representatives of the superfamily Siphlonuroidea (sensu Kluge et al., 1995) is outdated, inaccurate and incomplete. A taxonomic revision of the siphlonuroid genus Metamonius is presented here. New material is compared with descriptions in the literature of the three species of this genus in order to determine the variability of the more relevant characters; discrepancies with the authors of the species are discussed; the synonymy of M. anceps and M. fuengiensis is proposed; removal of the species M. hollermayeri from the genus is also proposed; description of the previously unknown male subimago of M. anceps is included, as well as notes on the biology and distribution of the genus. Association of larvae and winged stages is here confirmed by rearing.