Little hairy, green apple-like bodies with flowers on the end, within the inflorescence of bonesets (Eupatorium sp.) or closely related genera. The adult midge is a tiny, mosquito-like insect. Mama midge lays her eggs in the flowerheads of bonesets or relatives and the plant responds by walling off the maggot in a small little ball, called a gall. This is fine with the baby midge which is protected within the gall walls, and spends its formative time munching on gall tissues. Eventually it emerges to reproduce.

The tiny apples with flowers are distinctive, and the host plant gives a definitive identification. Neither the adult nor the maggot is likely to be identified, except by a midge expert.