A checklist of xyleborine ambrosia beetles (Coleoptera, Curculionidae, Scolytinae, Xyleborini) on a single fallen chinquapin tree (Castanopsis inermis) from Thailand: with a new species and a new country record

Twenty species of xyleborine ambrosia beetles were collected from a single fallen <i>Castanopsis inermis</i> tree. Amongst them, twelve species were recorded from <i>C. inermis</i> for the first time. One species, <i>Arixyleborus perbrevis</i> Sittichaya & Smith, sp. nov., is described as new to science, while <i>Cnestus ater</i> (Eggers 1923) is newly recorded from Thailand. Some biological observations on xyleborine ambrosia beetles are also presented.