The insects now under consideration belong to the family Psyllidae; sub-family Psyllinae; and the genus Pachypsylla. The genus, according to Dr. C. V. Riley, "has no equivalent in the European fauna; but some allied, still undescribed, genera occur in the New World."
Proceedings of the Iowa Academy of Sciences
©1893 Iowa Academy of Science, Inc.
Mally, Chas. W.
"Hackberry Psyllidae Found at Ames, Iowa,"
Proceedings of the Iowa Academy of Science, 1(Pt. 4), 131-138.
Available at: https://scholarworks.uni.edu/pias/vol1/iss4/45