Synergus japonicus Walker, 1874

Detailed re-description, diagnosis, and data on biology and distribution were provided by Pujade-Villar et al. (2014). The biology of the species is described in detail in Abe (990, 1992). For a long time the species was known only from Japan, but recently also recorded from China (Pujade-Villar et al. 2014). We collected and reared S. japonicus in large numbers from galls of A. kashiwaphilus in the Far East of Russia, Primorskij Kraj (Khazan Lake vicinity). So, currently the species is known from Japan, China and Russia.