Distribution.—I found this species in West Virginia and Maryland on P. tenuifolium, in Maryland on P. muticum and P. verticillatum, in Virginia on P. flexuosum, and in Connecticut on P. virginianum.

Biological notes.—Galls (Figs. 2–4)
are 4–8 mm in diameter, irregularly spheroid, dirty-white to brown outgrowths of rhizome buds. Each harbors one to several larvae, each in its own chamber. Larvae are yellow with a bright green gut and can be found at all seasons of the year. Pupation occurs in the galls and adults can be reared all summer long. An inquiline, described below as Hypogeadiplosis intrusa, is an occasional inhabitant in the galls.

- Raymond J. Gagne: (2018) The Gall Midges (Diptera: Cecidomyiidae) of Mountainmints, Pycnanthemum Spp. (Lamiaceae)^©