Novitsky, S. 1961 Synonymic notes on the San José scale parasite Pteroptrix dimidiata Westw. (Hym., Chalcidoidea, Aphelinidae).. Entomologist's Monthly Magazine 97: 193-194.

Notes: Scale hosts mentioned besides Quadraspidiotus perniciosus are Aspidiotus ostreaeformis and Hemiberlesia minima.