Subconical, thin-walled, obliquely-set, brownish or reddish leaf galls with a length of 1.5 mm, and a diameter of 0.5 mm.

Diarthronomyia californica Felt 1912:752, Junior secondary homonym of Rhopalomyia californica Felt 1908.
Rhopalomyia clinata Gagne 1975:483, new name for californica (Felt 1912a)

Lectotype, male, here designated, Claremont, Los Angeles Co., California, C. F. Stahl, emerged III-12-1912, "Artemisia californica"

This is small, brown, monothalamous, subconical, thin walled, naked, and protrudes at an oblique angle from the surface of the leaf. The gall is figured in Felt (1940).

Rhopalomyia clinata
Leaf Gall Midge

The midge induces small, tubular, thin-walled, monothalamous galls on leaflets of California sagebrush.