Platygaster tephrosiae sp. nov and P. vaccinii sp. nov. are described, with host information for these and for three further species of Platygastrinae: Metanopedias eupatorii Buhl, Platygaster munita Walker, and Trichacis virginiensis Ashmead. Hitherto undocumented galls on Galium circaezans Michx., Tephrosia virginiana (L.) Pers., and Vaccinium angustifolium Ait. are illustrated. © 2017 Informa UK Limited, trading as Taylor & Francis Group.