In Professor T.D.A. Cockerell's “ First Supplement to the Check-list of the Coccidæ” (published in the bulletin of the Illinois State Laboratory of Natural History, 1899), the following footnote occurs on page 398: “Phenacaspis, Cooley an Ckll., will be a new genus, to include P. nyssæ, Chinensis, engeniæ, etc., hitherto placed in Chionaspis. Mr. Cooley and the present writer agree that these forms have no generic relationship with genunie Chionaspis except through Aulacaspis and Diaspis. I leave Mr. Cooley to publish the generic characters, and classify the species.”