[1] Contribution from the Botanical Laboratory of the Ohio State
University, No. 92.
[2] Pergande, T. “North American Phylloxerinae affecting Hicoria and
other Trees.” Proc. Davenport Acad. Sci. 9:185-271, pls. 1-21. 1903.
[3] Felt, E. P. “The Identity of the better known Midge Galls.” Ottawa
Naturalist, Vol. 25, Nos. 11, 12. 1912.
[4] Küster, E. Die Gallen der Pflanzen, Leipzig. 1911.
[5] Cook, Mel T. “Galls and Insects Producing Them.” Ohio Nat.
4:140-141. 1904.