Cincticornia sobrina

Gall. An inconspicuous, circular, blister enlargement showing mostly on the under surface of the leaf and varying in diameter from 3 to 5 mm.

Adults of this form were first reared by the late Dr M. T. Thompson of Clark University, Worcester, Mass., from a vial containing earth brought into the laboratory for the purpose of. rearing Tineids. It was then thought that they might have come from some seed, possibly elm keys. Subsequent rearings in April 191 1 resulted in obtaining numerous flies, referable with little question to this species, from the leaves of the black oak, Quercus velutina, and probably those of other species, thickly infested with an inconspicuous, circular, blister gall.

- 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/556/mode/1up