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.

Swellings are 4–5 cm long. Larvae from the galls are tentatively identified as Neolasioptera. Host: A. venenosa. Distr.: New York.