| abstract | Diagnoses and a key for seven macrochelid mites species of two genera, Macrocheles and Holostaspella, associated with scarabaeid beetles in Sumatra are given. Those species include one new species, Macrocheles sukaramiensis sp. nov., and three species, Macrocheles oigru, M. kraepelini, and Holostaspella berlesei, recorded from Sumatra for the first time. The new species is described in detail on the basis of materials collected from scarabaeid beetle Catharsius molossus in the Province of Sumatera Barat, Sumatra. |