Callirhytis balanoides, new species

Host. — Quercus velutina Lamarck.

Gall. — Produced in autumn on small acorns of the current season, bursting out between the acorn and the cup. They secrete honey dew while growing. There are sometimes 2 to 3 galls on one acorn. When detached they are triangular in outline, flattened, the larval chamber transversely placed in the upper half of the gall and below it a spongy region which decays away after the gall drops, giving it an excavated base.

Habitat.— The type flies were bred from galls collected October 5. 1917, at Ironton, Missouri, the flies issuing May 5, 1919. Similar galls have been seen at Ithaca, New York; Glencoe, Illinois; East Falls Church, Virginia ; and at Wharton, Texas.

Callirhytis balanoides

Quercus velutina
Acorn galls
Pip gall in fall on acorns of current season, secreting honeydew.

[Photo caption]
On Q velutina in fall dropping in early Sept (IL); adults emerged the second spring May 5.