Two new leafhopper species, Longicornus concavus sp. nov. and Longicornus nonprocessus sp. nov., are described and illustrated from Tibet Autonomous Region, China. A key based on the aedeagus is given to distinguish all species of the genus. The type specimens of the new species are deposited in the Institute of Entomology, Guizhou University, Guiyang, China (GUGC).