(after Fletcher 2009): The presence of a large number of strong crossveins, which are as prominent as the longitudinal veins, distinguishes species in this genus. In most Tropiduchini and Tambiniini, the crossveins are lined up to form one, or usually two, preapical transverse lines with the remainder of the tegmen almost bare of crossveins. However, in Oligaethus, the crossveins are scattered throughout the tegmen as well as in a preapical line.
Fletcher MJ
(2009):
Identification keys and checklists for the leafhoppers, planthoppers and their relatives occurring in Australia and neighbouring areas (Hemiptera: Auchenorrhyncha). WEB