Ferris, G.F. 1943 Additions to the knowledge of the Diaspididae (Homoptera: Coccoidea). (Contribution no. 41).. Microentomology 8: 58-79.

Notes: Melanaspis -- 6 new species, notes on 4, key to 28 N. American; Aonidomytilus -- 2 new species, notes on 3, key to 11; Nicholiella -- 1 new speceis, key to 2.