Cecidomyiidae

Rhopalomyia

Ericameria nauseosa

Arizona

California

Colorado

Idaho

Kansas

Montana

Nebraska

Nevada

New Mexico

North Dakota

Oklahoma

Oregon

South Dakota

Texas

Utah

Washington

Wyoming

Alberta

British Columbia

Saskatchewan

Rhopalomyia glutinosa

Gall. — These are green, glabrous, cortical stem swellings which, as they age, become brown and present a very close resemblance to a group of Lecaniums. The gall has a height of about 2 mm. and a diameter of 3.5 mm., the midge escaping through a circular apical orifice.

New Western Gall Midges

Hemispherical or subglobose, green, glabrous, cortical, stem swellings, becoming brown and resembling Lecaniums, diameter 3.5 mm, height 2 mm. Fig. 226. Felt 'i6f, p. 188
Itonid. Lecanoid gall, Rhopalomyia glutinosa Felt

Key to American Insect Galls

Globular, resinous swellings...*Rhopalomyia glutinosa* Felt.
Swellings are monothalamous, Host: *C. nauseosus*. Distr.: unspecified and Utah.

The plant-feeding gall midges of North America

Jellybean-Gall Midge
Rhopalomyia glutinosa

This midge induces globular, shiny, lime-green or black, monothalamous stem galls. These hard, flat-topped glutinous blobs measure 3 mm high by 4 mm wide.

Plant Galls of the Western United States