The new deltocephaline leafhopper genus Oxycephalotettix is described and illustrated based one species, Oxycephalotettix tiputini sp. nov., from Ecuador, and is placed in Athysanini. The genus bears a superficial resemblance to Luheria Osborn (Luheriini), especially in the coloration of the forewing. Based on the examination of type material, Luheria constricta Osborn is herein considered a senior synonym of Tenucephalus hamatus DeLong, new synonymy. The female genitalia of L. constricta are illustrated for the first time, and the known range of this species is expanded to include Bolivia, northern Argentina, and northeastern Brazil.