The genus Jomine Graf-Kumagai has two described species known only from Brazil. A new species, J. paulista Herrera-Florez sp. n. is described and its host is given here. The material used in this work was obtained during a survey of the Geometridae larvae and their parasitoids in an understory at São Paulo, Brazil. An identification key to the species of Jomine is provided.
Keywords: Hymenoptera, Ichneumonoidea, South America, Neotropics, taxonomy, identification key, parasitic wasps, host record, Lepidoptera, Geometridae, Prochoerodes.