A one-page encyclopedia entry on the Coccidae, the family of scale insects, mealy bugs and bark lice. It covers their biology and the coverings they secrete, and notes the products derived from them: lac or shellac, the red dye lake, cochineal, other dyes, and waxes. It cites Newstead's monograph and a U.S. Department of Agriculture bulletin, and cross-references Lac Insect and Scale Insect.