Rhopalomyia anthophila, Solidago flower gall with 2 larvae - Rhopalomyia anthophila
Hawthorn Lake , Mahaska County, Iowa, USA September 10, 2009 Size: 6+ mm gall
Netta Dorchin posts (first image of flower galls): "The white larva in the gall is that of the gall midge and the smaller, more orange larvae is a parasitoid."