Australian leaf-hoppers (Jassoidea, Homoptera): Part 4 (Ledridae, Ulopidae and Euscelidae, Paradorydiini)

This paper is concerned with three groups of leaf-hoppers. These are not closely related to each other, but are considered together because of the striking similarity in appearance between certain representatives of each group. This resemblance may be due to the effect of identical environmental factors, to the possession, at least by two of the groups, of a similar inherent orthogenetic trend, or to chance resemblance furthered by parallel evolution.