Photo by Drees. Photo by Drees. Adults possess two pairs of membranous wings, with the forewing being larger than the hind wing. Wings are held roof-like over the body when at rest. Barklice have long, thin antennae.
Nymphs appear dark gray and pale banded between abdominal segments.
Eggs of psocids are laid singly or in clusters and are sometimes covered with silk or debris. Nymphs hatching from eggs resemble tiny wingless adults. Bark lice are gregarious and live together underneath layers of silken webbing. Barklice feed on fungi, algae, dead plant tissues and other debris. Consequently, they are considered harmless and perhaps beneficial to the trees they infest.