noun
psocid; booklouse
Refers to any insect of the order Psocoptera, commonly known as booklice or barklice. Often found in damp places or among old books.
古い本の間からチャタテムシが出てきた。
A booklouse came out from between the old books.
チャタテムシは湿気の多い場所を好む。
Psocids prefer humid places.
The name likely derives from the insect's habit of making a tapping sound (茶を立てる, cha o tateru, 'to make tea'), but the exact origin is uncertain.