Ferris, G.F. 1941 Contributions to the knowledge of the Coccoidea (Homoptera). IX. (Contribution no. 24). A forgotten genus of the family Margarodidae from Baltic amber.. Microentomology 6: 6-10.

Notes: Discusses forgotten genus (Acreagris) of the family Margarodidae from Baltic amber; points out relationship to Matsucoccus.