Callirhytis rhizoxenus, new species.
A large, irregular, more or less globular, fleshy swelling, occurring on the roots of an oak in Arizona, and containing numerous larval cells; some galls measure about 4 cm. in length; others are much smaller.
Specimens reared June 24 and 28 and July 6, 1882, from galls received from Mr. H.K. Morrison, collected on roots of a live oak at Fort Grant, Arizona.
”- William Ashmead: (1896) Descriptions of new Cynipidous Galls and Gall-Wasps in the United States National Museum©