Ferris, G.F. 1943a The genus Targionia Signoret and some of its allies (Homoptera: Coccoidea: Diaspididae). (Contribution no. 42).. Microentomology 8: 81-111.

Notes: List of 68 names at some time included in Targionia; redescriptions or notes on 8 species retained, and key to 6 species seen by author; redescriptions of 4 European Quadraspididotus; list of 7 definite and 3 possible Rhizapidiotus inclusions, redescription of 1.