A Review of the Hawaiian Hydrophilidae (Coleoptera)

Abstract

The species of Hydrophilidae occurring in the Hawaiian Islands are reviewed, with all genera and species keyed and briefly diagnosed. Six adventive species are reported for the first time from Hawaii: Coelostoma segne Balfour-Browne, Coelofletium exstriatum (Orchymont), Noteropagus obliquus Orchymont, Cercyon laminatus Sharp, Paroosternum horni (Orchymont), and Oosternum costatum Sharp. Of the 21 hydrophilids now known from the Islands, two are endemic, one is certainly indigenous, three are possibly indigenous, four are purposely introduced, and 11 are adventive.