Cynips quercus utricula, n. sp.

Globular, monothalamous galls on the petioles and leaves of Quercus alba. Thin-walled, .15 of an inch in diameter, green or purplish, pubescent. Sometimes entirely preventing the development of the leaf, and appearing on the end of the short petiole. Sometimes found on the end of a vein in a partially developed leaf, and more rarely surrounded by the lamina of the leaf. In the last case it appears on both sides of the leaf, but is most prominent above. It contains no larval cell. In size and in structure it resembles C. q. vesicula found on the same oak, but it is several weeks later and the insects differ materially. The flies appear early in June, and are of both sexes.

This species is often quite abundant in the limited space where I have found it. In describing the galls I should have added that the larva is not enclosed in a larval cell.

Habitat.--CT

- HF Bassett: (1881) New Species of Cynipidae^©

Reference: https://www.biodiversitylibrary.org/item/22092#page/88/mode/1up