title: A review of the primary types of the Hawaiian stag beetle genus Apterocyclus Waterhouse (Coleoptera, Lucanidae, Lucaninae), with the description of a new species.
abstract: The species of the Hawaiian stag beetle genus Apterocyclus Waterhouse (Coleoptera: Lucanidae) are reviewed following an examination of all primary types. Although the continued existence of the species is unknown and some possibly are extinct there are five recently extant species, including one species that is described here as new. The holotypes for all available names are pictured, and synonymies discussed and updated. Lectotypes are designated for Apterocyclus honoluluensis Waterhouse and A. munroi Sharp. A key to species and a revised catalog for the genus are provided.
authors.affiliation: Systematics Research Collections, University of Nebraska State Museum, W436 Nebraska Hall, Lincoln, NE 68588-0546 USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Paulsen
authors.affiliation: Department of Entomology, University of California- Riverside, Riverside, CA 92521 USA.
authors.forename: David C
authors.initials: DC
authors.lastname: Hawks
keywords: Hawaii; Scarabaeoidea; Systematics; endemic; taxonomic revision