WELD 1501. Plate 37, fig. 33.

Host.— Quercus agrifolia Nee, Quercus wislizeni A. de Candolle Quercus californica Cooper.

Gall — Abrupt oblong swellings at base of sprouts which are only a few millimeters in diameter. The gall may measure 25-35 mm. in diameter by 35-75 mm. long. It is hard and woody when dry, covered with normal brown bark which is not much thickened. Cells radially arranged in pockets in the wood. Exit holes with a characteristic smooth ring.

Habitat. — The writer has collected old galls on Quercus wislizenii on Mount Tamalpais, in San Gabriel and San Antonio River canyons in San Gabriel Mountains, in Ojai Valley, and at Santa Margarita, California; on Quercus agrifolia at Newhall, near Carpinteria, at Santa Margarita, Paso Robles, Paraiso Springs, Monterey, and Los Gatos; on Quercus californica at Dunsmuir and in Sequoia National Park. Fresh galls nearly full grown but too immature for rearing were seen only once at Monterey, on May 11, 1918.

- LH Weld: (1921) American gallflies of the family Cynipidae producing subterranean galls on oak^©

Reference: https://www.biodiversitylibrary.org/page/7562993#page/297/mode/1up