\Bark" louse`\ (Zo["o]l.)
An insect of the family {Coccid[ae]}, which infests the bark
of trees and vines.
Note: The wingless females assume the shape of scales. The
      bark louse of the vine is {Pulvinaria innumerabilis};
      that of the pear is {Lecanium pyri}. See {Orange
      scale}.