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Platygastroid wasps preserved in Dominican amber and oil shale from the Kishenehn formation (Montana, USA) in the National Museum of Natural History are catalogued. Compression fossils in Kishenehn oil shale yield a specimen of    Fidiobia   , a specimen of   Telenominae  , and a specimen with a    Scelio   -type ovipositor system. Twenty-five described genera are documented from Dominican amber, all of which are known from the extant fauna:    Allostemma    Masner &amp; Huggert,    Aradophagus    Ashmead,    Calliscelio    Ashmead,    Calotelea    Westwood,    Duta    Nixon,    Embidobia    Ashmead,    Embioctonus    Masner,    Fidiobia    Ashmead,    Gryon    Haliday,    Idris    Förster,    Inostemma    Haliday,    Leptacis    Förster,    Leptoteleia    Kieffer,    Macroteleia    Kieffer,    Odontacolus    Kieffer,    Opisthacantha    Ashmead,    Parabaeus    Kieffer,    Paridris    Kieffer,    Platygaster    Latreille,    Plaumannion    Masner &amp; Johnson,    Probaryconus    Kieffer,    Psilanteris    Kieffer,    Spiniteleia    Masner,    Telenomus    Haliday, and    Triteleia    Kieffer. Fourteen of these genera do not have previously published fossil records and are here documented for the first time.    Plaumannion   fistulosum    Talamas,  sp. n. , and    Paridris   yumai    Talamas,  sp. n.  are described as new species. A phylogenetic analysis of    Paridris    including    P.   yumai    is presented. A male specimen belonging to an undescribed scelionine genus is documented and illustrated, but not described, as the best features for circumscribing this taxon are found in the female, and monographic work on this group is currently underway by other workers. Four specimens from Baltic amber, belonging to    Leptacis   ,    Platygaster   , and    Sembilanocera    Brues are presented for comparison to extant specimens and inclusions in Dominican amber.

Fossil Platygastroidea in the National Museum of Natural History, Smithsonian Institution