A new species, Syntactus jiulianicus Sun & Sheng, sp. n. belonging to the tribe Pionini of the subfamily Ctenopelmatinae (Hymenoptera, Ichneumonidae), collected from Jiangxi Province, China, is reported. Illustrations of the new species and S. delusor (Linnaeus, 1758), S. minor (Holmgren, 1857) and S. varius (Holmgren, 1858) are provided. A key to the species of Syntactus known from the Oriental and Eastern Palaearctic Regions is given.

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