coyote brush twisted stem gall midge

(baccharis stem gall midge)
Rhopalomyia baccharis

Caution: There may be other wild species of this genus not yet included in this guide.

forms within branches of coyote brush (Baccharis pilularis)
a swelling and slight bending of the twig
adults look the same as coyote brush bud gall midge (Rhopalomyia californica), but galls and pupae are different

Chris’s observations: 2 (none are research grade)

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Bay Area species: iNaturalist