Takagi, S. 1974 An approach to the Hemiberlesia problem (Homoptera: Coccoidea).. Insecta Matsumurana (New Series) 3: 1-33.

Notes: THe Japanese species of Diaspidiotus and Quadraspidiotus revised and three species groups formed; Clavaspidiotus apicalis and Diaspidiotus hydrangeae new species; Clavaspidiotus and Comstockaspis revised.