Synergus japonicus WALKER , 1874

Synergus japonicus WALKER, 1874

The most abundant Synergus species, reared from cynipid oak galls, collected by us at the Xiaolongmen Biological Station ( China, Beijing Province, Mentougou District, 150 km NW of Beijing) during July 2002, from three unidentified Quercus species was Synergus japonicus . We reared this species from all three mentioned oak galls: “ Andricus sp. 1 ”, “ Andricus sp. 2 ”, “ Andricus sp. 3 ”, and from asexual galls of Andricus mukaigawae ( MUKAIGAWA, 1913). Both species, Andricus mukaigawae and Synergus japonicus are listed for the Chinese fauna for the first time. Synergus japonicus belongs to Section I ( MAYR 1872) of Synergus , which is characterized by a band of punctures on the posterior end of metasomal terga 2+3, reaching the ventral edge of the tergum, while the two newly described species belong to Section II ( MAYR 1872).