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Notes: This paper presents a key to 19 species with descriptions of all species except for the recently described Phenacoccus loiki Danzig. Lectotypes of 10 nominal species are designated. The following new synonymies are revealed: Phenacoccus Cockerell, 1893 (=Densispina Ter-Grigorian, 1964, syn.n.); Phenacoccus hordei (Lindeman, 1886) (=avetianae Borchsenius, 1949, syn.n.); P. aceris (Signoret, 1875) (=gorgasalicus Hadzibejli, 1960, syn.n.); P. karaberdi Borchsenius et Ter-Grigorian, 1956 (=affinis Ter-Grigorian, 1963; =gramineus Ter-Grigorian, 1964; =sogdianicus Nurmamatov et Bazarov, 1987, syn.n.).