5.2.20. The Scaphisoma bilobum species group

Four new species, S. bilobum, S. duplex, S. nishikawai, and S. spatuloides, possess aedeagus with trifid median lobe, as members of the S. haemorrhoidale group. They differ conspicuously from members of the latter group by the asymmetrical apical process of the median lobe partly overlapped by the apicodorsally expanded basal bulb.