A new and brachypterous species of Semanopterus Hope, 1847 (Coleoptera: Scarabaeidae: Dynastinae: Pentodontini) is described: S. kingstoni Reid & Tees, new species. The species is based on a single female specimen, collected on Lord Howe Island in the southwest Pacific Ocean. It is the sixth species of dynastine known from Lord Howe Island; a key is provided for identification of all of the species known from this small island.
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