Neuroterus distortus

Quercus bicolor, prinus [montana]
Stem galls, woody stem swellings
An enlargement on one side of the new growth causing the branch to bend abruptly. Several-celled.

[Photo caption]
On Q bicolor. Also on Q prinus [montana]. Adults emerge in May of the current season.

Neuroterus distortus

The writer has collected galls of this species on Quercus bicolor at Evanston, Wilmette, Glencoe, and New Lenox, IL, The flies issue during the first two weeks of May. A similar gall perhaps of this species was observed on the rock chestnut oak, Q. montana, near Alexandria, Va.

Neuroterus vernus variety distortus bisexual form

GALL. — A slight swelling of the bud or young leaf, petiole or vein; on Quercus bicolor.

RANGE. — Connecticut: Waterbury (?). New York, New Jersey (Beutenmuller). Probably confined to a more northeastern part of the United States.

This insect is closely related to variety tectus, but is apparently due to isolation upon the distinct host. Like tectus, this is a bisexual form, starting growth with the unfolding of the buds and maturing in May or June.