Booklice (Barklice)

Natural Habitat

High-humidity indoor environments such as libraries, kitchens, bathrooms, and under wallpaper; also found in pantry items or damp basements.

Diet & Feeding

Feeds primarily on microscopic mold, fungi, algae, and organic starches such as book bindings, wallpaper paste, and occasionally dry stored grains.

Behavior Patterns

Fast-running, wingless (in domestic species), and photophobic (avoid light). They thrive in humidity above 60% and are often found in clusters near moisture sources.

Risks & Benefits

Generally harmless to humans; they do not bite, sting, or spread disease. They are primarily nuisance pests that indicate a moisture or mold problem. They can damage antique books or contaminate stored dry goods.

Identified on: 4/20/2026