bark louse

Century Dictionary and Cyclopedia

1. n. A minute insect of the genus Aphis that infests trees; an aphid.
2. n. An undetermined lecanine, Lecanium sp.
3. n. A diaspine scale, Aspidiotus ancylus.
4. n. A diaspine scale, Aspidiotus uvæ.
5. n. A diaspine scale, Aspidiotus pyri.
6. n. A diaspine scale, Diaspis pyri.
7. n. The San José scale, Aspidiotus perniciosus.

Wiktionary

1. n. An insect of the family Coccidae that infests the bark of trees and vines.

GNU Webster's 1913

1. (Zoöl.) An insect of the family Coccidæ, which infests the bark of trees and vines.

WordNet 3.0

1. n. any of several insects living on the bark of plants
2. n. any of several insects living on the bark of plants