Trigonaspis obconica, new species

Host.--Quercus douglasii

Gall.--An underground cluster of fleshy white galls at base of stumps similar to galls of T. radicola (Ashmead), but with longer and more slender pedicels. After flies emerge the galls decay. In May.

Type locality. — Los Gatos, California. Paratypes from Paso Robles also.

Biology. — Collected at Los Gatos May 14, 1918, when galls contained pupae and exit holes showed where some adults had already emerged. In breeding cages three males issued May 16 and three more on May 17. At Paso Robles on May 6 galls contained larvae and pupae. In cage four adults issued by May 13, six by May 25, and one June 2.

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

Reference: https://www.biodiversitylibrary.org/page/7562993#page/256/mode/1up