Cynipidae

Callirhytis

Quercus buckleyi

Kansas

Oklahoma

Texas

Quercus imbricaria

Alabama

Arkansas

Delaware

Georgia

Illinois

Indiana

Iowa

Kentucky

Louisiana

Maryland

Massachusetts

Michigan

Mississippi

Missouri

New Jersey

New York

North Carolina

Ohio

Pennsylvania

Tennessee

Virginia

West Virginia

Quercus palustris

Connecticut

Maine

Nebraska

Rhode Island

Wisconsin

Ontario

Quercus phellos

Florida

South Carolina

Quercus rubra

Minnesota

New Hampshire

Vermont

New Brunswick

Nova Scotia

Prince Edward Island

Quebec

Quercus velutina

New American Cynipids from galls

Callirhytis balanacea (agamic)

Undescribed species

On Q velutina and rubra in fall on acorns of the current season. Globular, green to tan, 3-4 mm in diameter.

Cynipid Galls of the Chicago Area

Callirhytis balanacea, new species

Host.--Quercus palustris

Gall.--A pip gall produced late in fall beside small acorns of the current season. Almost spherical, up to 6.3 mm in diameter, smooth, bare, green with a small black papilla at apex, secreting honeydew. Full grown and dropping off during October after which a thin, fleshy outside layer soon turns black, wrinkles, and dries down on the hard inner shell, 3.5 by 4 mm, within which is a thick nutritive layer containing the larval cavity.

Biology.--Galls were collected in October 1930. During October 1931 most of the larvae transformed into adults, which remained within the galls on the ground during the winter and emerged March 26 to April 2, 1932. A few larvae hung over and adults emerged on April 1, 1933. From galls collected in October 1931 adults emerged March 14-28, 1933. October 1935 galls gave adults on March 28, 1937. On March 20 and April 1, 1940, adults emerged from galls collected in October 1938. One was captured at Mount Vernon, Va., on March 21, 1915, by W. L. McAtee. 

Habitat. — The type material was collected from two trees at East Falls Church, Va. Galls were seen at Waterford and Bluemont, Va., and at Poplar Bluff, Mo. William Beutenmueller collected galls in Woodlawn Cemetery, New York City, but failed to rear adults.

Callirhytis balanacea

Quercus imbricaria, palustris, phellos, rubra, velutina
Acorn galls
A pip gall in the fall beside small acorns of current season, spherical, up to 6.3 mm, smooth, bare, secreting honeydew, dropping in Oct and turning black.

[Photo caption]
On Q palustris. Also on Q velutina, phellos. Outer layer turns black, wrinkles, dries down on the hard inner shell (photo), drops Oct 12 (DC); adults emerged the second spring Mar 26-Apr 2 and the third spring in April.

Cynipid galls of the eastern United States

Acorn pip galls most consistent with the description of Callirhytis balanacea have been observed on its known hosts as early as June 11. While Weld consistently describes this species as a fall gall, it seems most likely that these [summer galls](https://www.inaturalist.org/observations/identify?reviewed=any&quality_grade=needs_id%2Cresearch&ident_taxon_id=1224692&month=6%2C7%2C8) are early galls of C balanacea.

Quercus buckleyi added tentatively as a host based on [this unconfirmed observation](https://www.inaturalist.org/observations/131013913). 

Gallformers ID Notes