The eccritotarsine plant bug genus Sinervus Stål is revised and the species S. apicalis, n. sp. from Honduras and S. cunealis, n. sp. and S. egeri, n. sp. from Brazil are described, bringing the total species in the genus to 11. Sinervus and the nine previously known species are diagnosed and the three new species are described. The genus Sinervaspartus, n. gen. is described to accommodate Spartacus discovittatus Carvalho, new combination (as the type species), Sinervus espartacoides Carvalho and Gomes, new combination, Spartacus venezuelanus Carvalho, new combination, and Sinervaspartus marginalis, n. sp. from Peru. Color dorsal images for all species, male genitalia for the new species, selected SEM micrographs, and keys to help distinguish Sinervus and Sinervaspartus and all included species are provided. Relationships with the New World genus Spartacus Distant and certain Old World genera are discussed.