Ferris, G.F. 1953a . Atlas of the Scale Insects of North America, v. 6, The Pseudococcidae (Part II). Stanford University Press Palo Alto, California 506 pp.
Notes: Key to 38 genera treated in vols. 5 and 6; descriptions and keys for 103 scale insects, including 22 new species, in 33 genera, 5 presented as new.