| Summary: | We demonstrated the life cycle closure of <i>Cynips conifica</i> Hartig, 1843 (presently <i>Andricus conificus</i>), previously supposed on the basis of molecular data, and the identity of the sexual generation, through laboratory experiments. As a consequence, <i>Andricus cydoniae</i> Giraud, 1859 became a junior synonym of <i>A. conificus</i> (Hartig, 1843). We provide illustrations and a diagnosis for adults and galls, observations on biology, and information on distribution. Moreover, as sexual galls of <i>A. conificus</i> cannot be distinguished from those of <i>Andricus multiplicatus</i>, a detailed comparison between sexual galls and adults of these two species is reported.
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