This paper, the fifth in a series of related ones dealing with the taxonomy of mealybugs, presents the authors’ careful studies on the reclassification of a series of ten specimens located in the British Museum and the United States National Museum. These slides contained eight North American species, as originally named, which have here been resolved into a series of seven species, as redescribed. The final result has usually been assignment to a different genus, sometimes with a different specific name. Full synonymy is presented, with its attendant bibliography. The species treated were omitted, or considered to be of dubious validity, by Ferris in his Atlas of the Scale Insects of North America.