Trigonaspis fumosa, new species

Host. — Quercus gambelii Nuttall.

Gall. — White, fleshy, fig-shaped, polythalamous, in clusters on root at base of tree like those of T. radicola (Ashmead). They rot after flies emerge.

Type locality. — Santa Catalina Mountains, Arizona. Galls collected June 27, 1918, on the Mount Bigelow trail near Soldier Camp at an elevation of 2,350 meters. Many adults had already emerged, and flies and pupae were found inside when galls were cut open. One fly was captured on oak at Mount Bigelow lookout tower.

Similar galls were seen in same locality on Q. reticulata Humboldt, Bonpland, and Kunth, and adults were emerging on June 26, but unfortunately none were preserved.

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

Reference: https://www.biodiversitylibrary.org/page/7562993#page/258/mode/1up