Gavrilov-Zimin, I.A. 2004 [Scale insects (Homoptera, Coccinae) of the Volga area.].. Entomologicheskoe Obozrenye 83(3): 523-529.

Notes: An annotated list of 45 species is given. 29 species from this list are noted as new for the region and one species is described as new to science. Perystrix gen. n. differs from the similar genus Phenacoccus Cockerell in the presence of long thin setae in cerarii instead of conical setae and the presence of pairs of lands (1 tubular duct + 1 multilocular disc pore) on dorsum. The type species of this monotypic genus, Perystrix ulmaria sp. n., has been collected in Volgograd Province from a trunk of Ulmus sp.