Distinguishing the sundaland species in the onthophagus (Parascatonomus) aurifex group (Coleoptera: Scarabaeidae: Scarabaeinae)

Abstract

The taxonomic position and diversity of the aurifex species group in the scarab genus Onthophagus Latreille, 1802, subgenus Parascatonomus Paulian, 1932, is discussed. The O. aurifex group is rediagnosed, and a key to the six known Sundaland representatives of the group is given. Two new species from North Sumatra are described and illustrated: O. semifex and O. sumawacus. A lectotype is designated for O. semiaureus Lansberge, 1883, the type locality here being restricted to West Java. Attention is drawn to the variation in this species and in O. aurifex Harold, 1877. Records are given for members of the aurifex group; several published records need confirmation. The species are associated with dung and carrion.