Notes on Neotropical Eumeninae, with the description of a new species of Pachodynerus de Saussure (Hymenoptera, Vespidae)

Taxonomic information on Neotropical Eumeninae is provided. A new species, Pachodynerusfessatus sp. nov. is described from southeastern Sao Paulo, Brazil. Additional material of Pachodynerus sericeus (Fox) was examined, representing the first further specimens after the original description and including the previously unknown male. The examination of new material of the genus Stenonarlonia adds some new distribution records and shows some previously unrecorded individual variation for some species. The males of Stenonartonia guaraya Garcete-Barrett and Stenonartonia rejectoides Garcete-Barrett are described for the first time.