Lyctus brunneus is a xylophage (wood-eating) insect[1] a species of beetle in the family Bostrichidae.

It is a member of the subfamily Lyctinae, the powderpost beetles.

It is known commonly as the brown powderpost beetle[2] or brown lyctus beetle.

Today it is distributed worldwide but it was probably originally native to the Neotropical realm.

[3] Like other powderpost beetles, this species lives in wood.