Booklice

Adult booklice are soft-bodied grayish-white to brown insects about 1-2 mm long, and are usually wingless and generally found in damp, warm, undisturbed areas in buildings. Outdoor species are often referred to as barklice as they are normally found under tree bark or leaves. 

Booklice are all female. Development occurs from unfertilized eggs. Each female is capable of laying in excess of 60 eggs. The young white nymphs emerge to feed on molds and mildews until they reach adulthood which can take between four to nine months. 

Booklice feed on microscopic mold and mildew and are more often found on walls within the home when the weather is humid and damp. They do not bite humans or animals, spread disease or damage household furnishings.