On leaf, under side, large, globular, 4-5 mm. dia. Light yellow-green
to brown, surface puberulent. A minute nipple terminates the gall.
Walls thin. Attached by a short pillar, over which the basal part of
the sphere fits like a cap. Surface of leaf not noticeably raised on
side opposite the gall.
Collected on _H. microcarpa_ in Ohio and _H. glabra_ in Connecticut.
This gall is very close if not identical with _Caryomyia similis_ Felt.
It differs from his description in that it is not “depressed.”
Felt, Jour. Econ. Ent. 4:456. 1911.
Felt, Bull. Brooklyn Ent. Soc. 8:99. 1913.