Forms detachable galls on oak leaves. "Produced singly on under side of leaf, 18-32 mm in dia., light green, spotted. June."
(1) "Globose, bright green with red spots, becoming yellowish-brown, slightly nippled, thin-shelled, glossy, the central larval cell supported by radiating fibers, diameter 1 to 1 1/2 inches."
(2)