Cincticornia globosa

This dark-brown species with short, relatively broad wings was reared in some numbers from a subhemispheric, brown, slightly nippled, oak leaf gall on black oak, probably Quercus velutina, in April and May 1909 from material collected by Miss Cora H. Clarke at Magnolia, Mass., in October 1908. Apparently the same gall was taken by Miss Clarke on the scarlet oak, Quercus coccinea. A very similar oak leaf gall may produce a Cynipid.

Gall. Subhemispheric, brown, slightly nippled, 1.75 mm in diameter. It is monothalamous, occurs on the under side of the leaf and causes on its upper surface a slight, brownish elevation encircled by yellowish orange.

- EP Felt: (1915) 31st Report of the State Entomologist on Injurious and Other Insects of the State of New York^©

Reference: https://www.biodiversitylibrary.org/page/36619989#page/548/mode/1up