Ohio Journal of Science. — Vol. XVI. Plate II.
Footnotes:
[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.