or bark louse

noun, plural bark·lice [bahrk-lahys] /ˈbɑrkˌlaɪs/.
  1. any of numerous insects of the order Psocoptera that live on the bark of trees and other plants.
See also psocid.

Origin of barklouse

An Americanism dating back to 1835–45; bark2 + louse Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018