Adults emerged from galls in the laboratory within two weeks of their collection on April 22, 1968 at Site 14.

This bud gall (Fig. 21) is a confluent mass of swollen leaf rudiments which are green and densely covered with trichomes. Each leaf rudiment tapers from a broad base to a blunt apex, becomes woody at maturity, has a single larval chamber at the base, is hollow in the center, and has a thin septum at the apex that bears a mass of long trichomes. The hollow portion is utilized by the pupa to facilitate escape. The pupal exuvium remains at the ruptured septum. The old galls persist on the plant indefinitely. Three mature galls had a respective length of 8, 6, and 8 mm with a basal width of 4, 4, and 6 mm.

The formation of these galls marked the end of any normal growth from the buds. However, these galls were never abundant enough to cause any significant damage to sagebrush plants.

- Robert G. Jones, Raymond J. Gagné, William F. Barr: (1983) Biology and taxonomy of the Rhopalomyia Gall Midges (Diptera: Cecidomyiidae) of Artemisia tridentata Nuttall (Compositae) in Idaho^©