Booklouse (or Psocid)
Scientific Name: Liposcelis spp. (Common genus for household booklice)
Order & Family: Order: Psocodea (formerly Psocoptera), Family: Liposcelididae
Size: Very small, typically 1 mm to 2 mm in length.
Natural Habitat
Typically found in areas with high humidity, such as bathrooms, kitchens, basements, or near leaky pipes. They often live in wall voids, books, papers, stored grains, and moldy upholstered furniture.
Diet & Feeding
They feed primarily on microscopic mold and fungi, as well as starches found in book bindings, wallpaper glue, and some stored pantry grains.
Behavior Patterns
Booklice are flightless and move by crawling rapidly. They do not bite. They thrive in damp conditions which promote the mold growth they eat. Unlike true lice, they are free-living and do not live on hosts.
Risks & Benefits
Risks: They are generally considered a nuisance pest rather than a health threat. They do not bite humans or pets, nor do they transmit diseases. However, in large numbers, they can contaminate stored food products and damage paper goods or books. Their presence is usually an indicator of high humidity or moisture problems.
Identified on: 3/2/2026