Psocoptera: Psocids, Barklice, Booklice
(from the Greek: psocho = to rub or grind into small pieces + ptera = wings)
Although the name "psocoptera" suggests that these insects grind wood, psocids primarily feed on tiny fungi that grows on moldy or decaying wood. They are small, delicate insects, with long thread-like antennae, and chewing mouthparts. They are wingless or have 2 pairs of wings. Metamorphosis is incomplete. Booklice are wingless and are common in homes, often occurring in large numbers around musty books or in humid flour or meal. Barklice are usually winged and can be found scurrying on tree bark.