Phytomyza krygeri Hering

Material examined. MASSACHUSETTS: Franklin Co., Northfield, 42.647283, -72.424726, 20.vi.2017, em. 26.iv–6.v.2018, C.S. Eiseman, ex Aquilegia canadensis seedpods, # CSE4441, CNC1135721–1135728 (5♁ 3♀) ; WISCONSIN: Vernon Co., Battle Bluff Prairie State Natural Area, 43°18′5.04″N 91°48′6.60″W, 13.vi.2017, em. spring 2018, J. van der Linden, ex Aquilegia canadensis, # CSE4947, CNC1288661–1288662 (2♀) .

Hosts. Ranunculaceae: Aquilegia * canadensis L., A. vulgaris L. (Lonsdale 2017b).

Larval biology. Larvae feed in developing seed pods, which become distorted and discolored brown.

Puparium. Formed within the seed pod; subshining and dark brown, almost black; similar in size and appearance to the remains of the slightly paler brown seeds damaged by larval feeding (Lonsdale 2017b).

Phenology and voltinism. This species is univoltine, overwintering as pupae. In Ottawa, adults are present in May and puparia are formed by the end of June (Lonsdale 2017b).

Distribution. * USA: [IA], MA, WI; Canada: ON; Europe (Lonsdale 2017b).

Comments. This European species was discovered ovipositing in flowers of cultivated European columbine in Ottawa, Ontario in the spring of 2015 (Lonsdale 2017b). The new rearing records, along with larvae and puparia we observed in northeastern Iowa in June 2018, indicate that it is already widespread in the USA and utilizing native columbines .