Keosarima gen. nov., a new genus in the planthopper tribe Sarimini from Indochina (Hemiptera: Fulgoromorpha: Issidae)

A new genus of Issidae in the tribe Sarimini (Hemiptera: Fulgoromorpha), Keosarima Constant gen. nov., is described to include two new species, Keosarima armillata Constant gen. et sp. nov., collected in Keo Seima Wildlife Sanctuary in Mondulkiri Province in Cambodia, and K. konkakinha gen. et sp. nov., collected in Kon Ka Kinh National Park in Central Vietnam. As a result, four species of Issidae, including two Sarimini, are now recorded from Cambodia, and 59 species, including eight Sarimini, are recorded from Vietnam. A distribution map and illustrations of specimens, terminalia, habitat are provided, as well as a record of trophobiotic interaction for K. armillata, with ants in the genus Camponotus Mayr, 1861 (Hymenoptera: Formicidae). The relationship with the genus Tetrica Stål, 1866 is briefly discussed.