Cooley, R.A. 1899 The coccid genera Chionaspis and Hemichionaspis.. Special Bulletin, Hatch Experiment Station of the Massachusetts Agricultural College 1899: 1-57.

Notes: Classificatory study; key and descriptions for 16 Chionaspis including 4 new; same for 11 Hemichionaspis, including 2 new.

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