The leafhopper genus Scaphotettix Matsumura is redescribed, and three new species are described and illustrated: S. striatus Dai and Zhang, sp. nov. from Java (on bamboo) and China; S. bispinosus Dai and Zhang, sp. nov from China; and S. pectinatus Dai and Zhang, sp. nov. from Vietnam. Most other species of Scaphotettix were re-examined and found to belong to a new genus also described herein, Scaphomonus Viraktamath, gen. nov.. The new genus is compared with the superficially similar Melanetettix Knight and Fletcher, Scaphodhara Viraktamath and Mohan, and Scaphoideus Uhler and a new species, Scaphomonus vateriae Viraktamath, sp. nov. from India, is described and illustrated. In addition, the following new combinations are proposed (all previously placed in Scaphotettix): Scaphomonus agumbensis (Viraktamath and Mohan) comb. nov.; S. arcuatus (Viraktamath and Mohan) comb. nov.; S. freytagi (Viraktamath and Mohan) comb. nov.; S. indicus (Distant) comb. nov.; S. longistylus (Li and Wang) comb. nov.; S. malnadicus (Viraktamath and Mohan) comb. nov.; S. quadrifidus (Viraktamath and Mohan) comb. nov.; S. redundans (Distant) comb. nov.; and S. splinterus (Li and Wang) comb. nov. Three species, Scaphotettix fanjingensis Li and Wang, Scaphotettix redstripeus Li and Wang, and Scaphotettix slenderus Li and Wang, do not belong to the genus Scaphotettix and are not treated further. Keys are provided for species of both Scaphotettix and Scaphomonus.