Diplolepis splendens
The writer collected galls of this species November 7, 1921, in Blue Canyon west of Socorro, N. Mex., on Quercus undulata, adults emerging April 5 and 26. More were taken near Magdalena on Q. grisea, the galls containing adults in December, flies emerging March 9, April 6, and many April 26. They were also taken on Q. undulata in Nogal Canyon south of Socorro and at Kingston on Q. grisea. The species was previously known in the United States only from Q. grisea and from Arizona.
”- LH Weld: (1926) Field notes on gall-inhabiting cynipid wasps with descriptions of new species©
Reference: https://www.biodiversitylibrary.org/page/7610635#page/300/mode/1up