A new species of cerocephaline (Hymenoptera: Pteromalidae: Cerocephalinae) wasp from the Piedmont region of Italy. The new species, Cerocephala flava, n. sp., was reared from thousand cankers disease infested wood and is described along with an updated description for Cerocephala caelebs (Masi). Species from three different genera of Cerocephalinae have been reported from thousand cankers disease wood, and circumstantial evidence suggests that the disease vector, Pityophthorus juglandis Blackman (Coleoptera: Curculionidae: Scolytinae), is the host for these parasitoids. It is undetermined whether the new species is native to Italy or a parasitoid that has been introduced from North America along with the disease and its vector. Sequence data (CO1) is provided for the new species along with evidence that Cerocephala might be nested within Theocolax. No further taxonomic reclassification is performed at this time since more comprehensive molecular work between cerocephaline genera is needed to determine their relationships.