Gall. -- Elongate swellings of the stalk of the pubescent angelica (Angelica villosa [now venenosa]). Each gall contains numerous larvae, which are in a large chamber filled with pith of the plant. Sometimes as many as four swellings are on a single stalk. Length, 25 to 55 mm.; width, 8 to 14 mm. The larvae hibernate in the gall.
”- 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