booklice http://ento.psu.edu/extension/factsheets/booklice Psocids (booklice) Penn State Department of Entomology Booklice Booklice http://ento.psu.edu/extension/factsheets/booklice http://ento.psu.edu/extension/factsheets/booklice http://ento.psu.edu/extension/factsheets/booklice