Cynips affinis n. sp.

Monothalamous, round, thin-walled galls in the buds of Quercus prinoides, usually partly hidden in the scales of the bud, but in some instances standing out round and free like a little blister on the twig, in size only large enough to hold the larva within, and in color dark brown and grayish spots, or wholly brown. These galls are half-grown in the autumn and develop so rapidly in the spring that the insects come out just as the leaves begin to expand.

I should have been disposed to consider this species a variety of C vesicula, which, both in gall and in insect, it closely resembles, had not late discoveries shown that dimorphic species often in one generation closely resemble each other and in the next develop characters that fully establish their non-identity.

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

Reference: https://www.biodiversitylibrary.org/page/3043686#page/113/mode/1up