Book Louse- (Liposcelis bostrychophilus) About 1-1.5 mm in length
with a transparent body, dull brown to reddish brown head, chewing
mouthparts and long antennae. In the younger stages, book lice
appear transparent and become more opaque with age. They prefer
areas that are humid, damp, dark and undisturbed.
They are often found in book bindings and alongside the edges
of pages. Book lice feed on fungus and therein cause damage to
the book. Discovering such insects in you collection is a direct
sign of a pontential mold problem.