Urich, F.W. 1893 Notes on some insect pests of Trinidad, British West Indies.. Insect Life 6: 196-198.

Notes: Scale species mentioned include Orthezia insignis, Lecanium hemisphaericum, Diaspis boisduvalii, Aspidiotus, Asterolecanium, Chionaspis, Lecanium, Mytilaspis, Pulvinaria, Vinsonia, Ischnaspis, Pinnaspis, Icerya and Planchonia.