Rhoades, M.H., Kosztarab, M.P., & Rajotte, E.G. 1985 Identification, hosts and distribution of Pseudaulacaspis pentagona (Targioni-Tozzetti) and P. prunicola (Maskell) in Virginia (Homoptera: Diaspididae).. Proceedings of the Entomological Society of Washington 87: 545-553.

Notes: Compared the records of the two species; concluded that they are two distinct species; however, some of their morphological characters are quite different from those in the world sample.