The gall is broader than long, having a breadth of about 2 1/2 inches and a length of 2 inches, the surface largely indented, of a leathery texture, and so hard that it can only be cut with difficulty; the inside is also hard and is of a close compact spongy nature. Its color closely resembles that of the twigs. Intersected through it at irregular intervals are oval cells about 1 1/2 millim. in length. The outer margin of the cells is hard, woody, and white. The gall is situated at the end of a twig.
”- Osbert Salvin, Frederick DuCane Godman: (1900) Biologia Centrali-americana Insecta. Hymenoptera · Volume 33©