I've been seeing these galls on Goldenrod, Solidago
sp., a lot this year. Gagne's book, "The Plant-Feeding Gall Midges of North America" keys: Solidago
, bud or flower gall, galls cylindrical-not formed of leaf rosette, modified floret, gall widest at base-fuzzy = Rhopalomyia anthophilia
. I'm most interested in the 2 larvae inside of the one gall I cut open: a fly and a parasitoid wasp perhaps?
Later: emergence of adult flies:
and several parasitoids: