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- Syntactus Förster, 1869. Verhandlungen des Naturhistorischen Vereins der Preussischen Rheinlande und Westfalens, 25(1868):210. Type-species: Ichneumon delusor Linnaeus; designated by Perkins 1962.
- Tromopoea Förster, 1869:210. Type-species: Catoglyptus minor Holmgren; designated by Perkins 1962.
- Brischkea Kriechbaumer, 1897:167. Type-species: (Brischkea parvula Kriechbaumer) = delusor Linnaeus; monobasic.
Syntactus can be distinguished from all other genera of Pionini by the combination of the following characters: Apical margin of clypeus blunt. Clypeal foveae open, extraordinarily impressed. Subbasal portion of lower margin of mandible sharp, its outer face without a basal impression. Upper end of epicnemial carina reaching front margin of mesopleuron. Areolet absent. Nervellus subvertical. Glymma absent. Ovipositor thin, needle-like, straight or slightly upcurved.
Key to species of Syntactus Förster known in Oriental and Eastern Palaearctic Regions
- Sun, S; Sheng, M; 2012: A new species of genus Syntactus Förster (Hymenoptera, Ichneumonidae, Ctenopelmatinae) with a key to Oriental and Eastern Palearctic species ZooKeys, 170: 21-28. doi