Although they are called lice, the Psocoptera are free-living insects, not parasites.

These insects are, if somewhat arbitrarily, discussed in two groups, barklice and booklice, based on whether they tend to live outdoors or in human habitations. Most of them live outdoors.

A photograph of an adult Barklouse (_Graphopsocus cruciatus_)

Adult barklice (like this Graphopsocus cruciatus) are often winged.
Photograph by Jean-Jacques Milan, used under GFDL.

Other names for (or types of) Psocoptera include:

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