Oompsodryoxenus maculipennis Ashmead.
Gall. On twigs of live oak (Quercus sp.) Polythalamous. Irregularly rounded or elongate, hard woody swellings, very much like that of Andricus coxii Bassett.
Habitat: Arizona.
The types are in the United States National Museum.
”- William Beutenmuller: (1909) Some North American Cynipidæ and their Galls©