McKenzie, H.L. 1960 Taxonomic study of California mealybugs with descriptions of new species (Homoptera: Coccoidea: Pseudococcidae).. Hilgardia 29: 681-770.

Notes: Review of mealybug taxonomic morphology; Chorizococcus, Pygmaeococcus n. gen.; 29 new species in 19 genera; revised key to North American pseudococcid genera; keys to North American species of 9 genera.