The fauna of Ceraphronoidea in Poland is exceptionally poorly known; only eleven species of Ceraphronidae and five of Megaspilidae have been recorded so far. The occurrence of another species, Aphanogmus terminalis (FÖRSTER) (Ceraphronidae) is reported here, on the basis of a male specimen reared from a gall of Rhabdophaga sp. (Cecidomyiidae) collected near Poznań, Western Poland. This minute wasp has been known so far only from Switzerland, Sweden, Denmark, Finland, Ireland and Romania.