Andricus seminosus

Cynipidae

Callirhytis

Quercus palustris

Arkansas

Connecticut

Delaware

Georgia

Illinois

Indiana

Iowa

Kansas

Kentucky

Maine

Maryland

Massachusetts

Michigan

Mississippi

Missouri

Nebraska

New Jersey

New York

North Carolina

Ohio

Oklahoma

Pennsylvania

Rhode Island

Tennessee

Virginia

West Virginia

Wisconsin

Ontario

Quercus rubra

Alabama

Louisiana

Minnesota

New Hampshire

South Carolina

Texas

Vermont

New Brunswick

Nova Scotia

Prince Edward Island

Quebec

Cynipid galls of the eastern United States

Callirhytis seminosa

Andricus (callirhytis) seminosus n. sp.

Galls.--Hard, woody knots, sometimes terminating the shoots in a clump of oak sprouts (Q castanea?), but oftener an enlargement of the base of the small lateral branches. In my specimens the terminal galls are an inch in diameter and shaped like a strawberry. The others are about half as large, and of the same shape. All are more or less uneven on the surface. These are all old galls and the outer bark has mostly fallen off, and the entire surface is dotted as thickly as possible with very small, open larval cells. The larger galls must contain, each, several hundreds of these tenantless cells. The cells are distinct from the woody fibre in which they are imbedded, but cannot be separated from it. The galls are easily taken for those of A scitula Bass. and such I took them to be until I found that the insects were very different. 

New Species of North American Cynipidae (1890)

Callirhytis seminosa

Quercus palustris, rubra
Stem galls, woody stem swellings
Abrupt, surface very irregular, cells near surface and very numerous.

[Photo caption]
On Q palustris. Also on Q rubra. Date of emergence of maker unknown.