One new species of Dinetus is described and illustrated: D. hameri Notton sp.n. from the United Arab Emirates; D. politus stat.rev. is raised in rank to a full species (formerly a subspecies of D. cereolus). Two new subgenera are described: Dentidinetus Olszewski, Notton & Kitching subg.n. and Venustidinetus Olszewski, Notton & Kitching subg.n. and all known species are assigned to subgenera. An illustrated key for identification of world Dinetus species is given and a phylogenetic analysis of Dinetus based on morphological characters is presented.