Rhopalomyia sulcata
Tube Gall Midge
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This midge induces columnar or tubular, glabrous, monothalamous leaf galls on several species of Baccharis, particularly Desert Broom in the Mojave Desert, California. These blunt-tipped galls are usually found growing at an oblique angle out of the middle of the long, linear leaves or from the tips.

Host:
Baccharis sarothroides

Range: California, the Southwest, Mexico

Rhopalomyia sulcata Gagne New Species

Holotype. — From columnar gall on B. salicina, Pecos R., Loving, Eddy Co., New Mexico

Distribution. — United States: Arizona, New Mexico, western and southern Texas; Mexico: Durango, Nuevo Leon.

Hosts: This species is reported from B. halimifolia, B. heterophylla, B. neglecta, B. pteronioides, B. salicina, and B. sarothroides. The record on B. heterophylla is based only on similarity of the galls, but the other host records are based on adults and/or pupae. A generation of R. sulcata was reared from B. halimifolia and B. sarothroides in a greenhouse from a generation that came from field-collected galls on B. salicina.