Vanhornia leileri Hedqvist, 1976 in France (Hymenoptera, Proctotrupoidea, Vanhorniidae). Vanhornia leileri was recently collected in the French part of the Jura massif, in the Lac de Remoray Nature Reserve. This species described from Sweden was then found in the Russian Far East, the Swiss Jura, Germany and very recently the Netherlands. The presence of V. leileri at the northeast of the Jura massif is the second mention of this parasitoid in France after a previous one from Haute-Savoie. The apparent rarity of this parasitoid seems to be linked to that of its saproxylic Eucnemidae beetle hosts. We present here the main knowledge acquired on Vanhorniidae and this species still so little known.