These are insects that nest in textile stuff or books and can be found in our homes, warehouses, cellars. The majority are from thefamily of Dermestid.
The best known are the “black beetles of the Carpet” (Attagenus unicolor), specialized in upholstered furniture and causing allergies, “Museum Beetles“ (Anthregenus scropphulariae), also known as “buffalo bugs“ as the first specimens were located in buffalo skin and whose health effects are dermatitis.
Another well-known family attacking textile stuff are moths, and the most frequent is the Common Fur Moth (Tinneola bissiella) which owes its name to silk produced by their larva. Another species is the Moth of Closets (Tinneola pelllionetta), whose name is also related to the shape of the cocoon silk they weave and drag everywhere.
Referring books, we have Silverfish and Fire Insects, both from the family of Lepismatidae and differentiated by color. The latter also appears between the toilet joints.
Finally, we find the Psocoptera, which can cause small skin irritations or asthma in significant quantities. They parasitize books,especially if we have high humidity levels.