[1] Most species are 3.0-4.5 mm long and have many setae (hairs) on the veins and margin of the forewing.

[2] Like the other members of the infra-order Caeciliusetae, they have a broad, flat labrum, with well defined edges.

The large genus Amphipsocus (98 named species) is found in the Afrotropics and eastern Asia.

The genus Polypsocus is endemic to the Americas; Europe has two species, Kolbia quisquiliarum and Brachypsocus badonneli.

[2] These 21 genera belong to the family Amphipsocidae: Data sources: i = ITIS,[3] c = Catalogue of Life,[4] g = GBIF,[5] b = Bugguide.net[6]