The present report, which is the 4 th one of the serial reports of Korean SCarabaeoidea, is concerned with an introduction to the aphodiidae and with the systematic account six species which belong to the genus Aphodius and have a large scutellum. It is discussed that the subspecies of Aphodius apicalis are no more than the aberrant forms of this species, and then an aberrant form, Aphodius (Otophorus) brachysomus ab. Flavelytrus, is described.