Xystoteras volutellae, sp. n.

Host: Quercus macrocarpa

Gall--A conical, bluish-gray gall, from 3 to 3.5 mm high by 2.5 mm in diameter at base; occurring singly or in great numbers on the under surface of leaves of Quercus macrocarpa in Riley County, KS. The top of the gall is truncate and internally it is hollow, with the larval cell or kernel, resembling a minute nipple, situated at its base. The gall is attached to the leaf by a few fibres and may easily be detached. The colour of the gall is produced by a powdery or pruinose bloom which completely covers it when fresh.

The wasp, according to Mr Marlatt, issues from the gall early in January.

Range: KS

- William Ashmead: (1897) Descriptions of Five New Genera in the Family Cynipidae^©

Reference: https://www.biodiversitylibrary.org/item/88720#page/286/mode/1up