Dryophanta eburneus, n. sp.

Galls round, smooth, polished, resembling old ivory. They are from one-eighth to three-sixteenths of an inch in diameter, growing in great numbers on both the upper and under surface of oak leaves of a species I have not yet determined. The galls were sent me by A. H. Siler from southern Utah. Sometimes the galls are so crowded that they lose their globular form. They are strongly attached to the leaves and the base of the gall is usually grooved by the vein on which it grows. There are often twenty or thirty galls on a single leaf, one-third of which will be on the underside. They are hard and rather thick shelled and filled with fine silvery white hairs that radiate from the single larval cell that is attached to the base of the gall.

From several thousand galls I have reared less than fifty gall-flies. These are all females.

- HF Bassett: (1890) New Species of North American Cynipidae (1890)^©

Reference: https://www.biodiversitylibrary.org/item/32322#page/78/mode/1up