Williams, D.J. 1973a Two cactus-feeding mealybugs from Argentina (Homoptera, Coccoidea, Pseudococcidae).. Bulletin of Entomological Research 62: 565-570.

Notes: Pedronia festeriana transferred to Hypogeococcus and redescribed; key; hosts and distribution; Pseudococcus eriocerei n. sp. described; hosts and distribution; damage.