Please refer to the following link for further details: Ceinae = Link 1
There are about 14 species in 6 genera in 6 genera that have been identified north of Mexico. They have slender, laterally compressed bodies, an elongated pronotum. Most species black, and some hve light colored markings. The antennae are clubbed. They are widespread in North America. They occur on grasses and shrubs. The larvae bore into stems and some are serious pests, such as the wheat stem sawfly.
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Darling, D. C. 1996. A new species of Spalangiopelta (Hymenoptera; Pteromalidae; Ceinae) from Dominican amber: Phylogenetic and biogeographic implications. J. Kans. Ent. Soc. 69(4): 248-259.
Viggiani Gennaro. 1977. Lotta biologica ed integrata. Liguori editore. Napoli, Italia.