a member of the family Lyctidae (true powderpost beetles) or Bostrichidae (false powderpost beetles) —note 1. the larvae of powderpost beetles tunnel in the sapwood of partially or completely dry timber and wood products, mainly hardwoods, leaving a fine powdery bore dust, Lyctus beetles (Lyctus sp.) being particularly destructive —note 2. Bostrychidae that make augerlike tunnels, mainly in the sapwood of hardwoods, are termed auger beetles —see ambrosia beetle, wood borerThis definition last updated 07/30/2008