New brachypterous species of Dichotomius (Selenocopris) Burmeister (Coleoptera: Scarabaeidae: Scarabaeinae) with the definition of species groups and taxonomic notes in the subgenus

Five species groups of Dichotomius (Selenocopris) are defined and separated in an illustrated key in the first effective attempt of systematization of the subgenus. Four new brachypterous species of Selenocopris are described and the also brachypterous Dichotomius ingens (Luederwaldt) is redescribed. These species are diagnosed, illustrated and assigned to the quadraticeps species group. Taxonomic issues on the subgenus are discussed. Copyright © 2016 Magnolia Press.