Cynips nigricens n. sp.

Galls in clusters attached to the midrib on the underside of the leaves. The galls are cone-shaped, and resemble very small galls of C. strobilana. The galls fall to the ground a little before the leaves drop in the fall. From a large number of these galls gathered in October, 1887, I obtained one perfectly developed female late in September, 1888.

- CP Gillette: (1888) A Study of the Cynipidae^©

Reference: https://www.biodiversitylibrary.org/page/13762219#page/227/mode/1up