Gall. -- Green, globular or somewhat elongate swellings on the stalk of marsh St. John's wort (Triadenum[now Hypericum] virginicum). Length, 6-10 mm.; width, 5-5.50 mm.
”- BEUTENMULLER, WILLIAM. "On some apparently new Cecidomyiidae." The Canadian Entomologist 40.2 (1908): 73-75.: (1908) ON SOME APPARENTLY NEW CECIDOMYIIDAE©
Reference: https://www.biodiversitylibrary.org/item/88726#page/88/mode/1up