Gavrilov-Zimin, I.A., & Smirnova, N.V. 2005 Scale insects of the Volga Area (Homoptera: Coccinea). II. Scale insects from Nizhniy Novgorod Province, Chuvashia and Mari-El.. Zoosystematica Rossica 14(2): 207-209.

Notes: Eight species collected in the upper Volga Area are listed. Six species, Orthezia urticae (Linnaeus), Trionymus perrisii (Signoret), Acanthococcus baldonensis Rasina, Greenisca brachypodii Borchsenius et al.; Eriopeltis lichtensteinii Signoret, and Chionaspis salicis (Linnaeus) are recorded from the Volga Area for the first time. Variability of Trionymus perrisii (Signoret) is discussed and illustrated.