When found indoors psocids, often called booklice, are very minute and are only 1/25 to 1/13 of an inch in length. Booklice can be found outdoors may be larger, up to 1/4 of an inch long.
These are very common in pest monitors-they look like small specks and will need a hand lens to identify. They may or may not have wings. The outdoor species of psocids are called barklice.
Psocids prefer warm, humid or damp places. Barklice, as psocid species that live outdoors are often called, live outdoors on or under bark, grass, leaves, damp wood, etc.