Callirhytis marginata, new species

Host.—Quercus coccinea Muenchhausen.

Gall.— Abrupt cushion-like swelling in the bark just at or below the surface of the ground on young sprouts which are 5-10 mm. in diameter. Single or confluent so that they may contain one to a half a dozen cells which are 4-5 mm. in diameter. They are similar to those of Callirhytis rubida Weld.

Type locality. — Fort Sheridan, Illinois. One cluster of these galls was found April 25, 1915, and one fly emerged in collecting box and two were cut out of galls. Three more of same species were found ovipositing in the side of the swelling buds in the same clump of sprouts at whose base the galls were found.

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

Reference: https://www.biodiversitylibrary.org/page/7562993#page/279/mode/1up