Amphibolips melanocera Ashm.
Galls.--Greenish brown and yellowish green round, globular galls, issuing from bud axils of Quercus aquatica [nigra]; they vary greatly in size from one-quarter to half an inch in diameter. The outer shell is very thin, and interiorly there is a central kernel held in place by some very thin hair-like filaments.
This species resembles Amphibolips citriformis. The gall, too, is markedly different in shape, although constructed on the same plan as in that species.
Described from eight specimens bred in June.
”- William Ashmead: (1885) A Bibliographical and Synonymical Catalogue of the North American CYNIPIDAE, with descriptions of new species.©
Reference: https://www.biodiversitylibrary.org/item/32307#page/309/mode/1up