Liriomyza arctii Spencer

Material examined. MASSACHUSETTS: Hampshire Co., Northampton, 42.318438, -72.643259, 1.vi.2018, em. 19–21.vi.2018, C.S. Eiseman, ex Silphium perfoliatum, # CSE4637, CNC1144085–1144088 (3♁ 1♀) .

Hosts. Asteraceae: Arctium lappa L., A. minus (Hill) Bernh., Bidens cernua L., Heliopsis helianthoides (L.) Sweet, * Silphium perfoliatum L., Verbesina alternifolia (L.) Britton ex Kearney (Eiseman & Lonsdale 2018).

Leaf mine. Greenish, entirely linear; on Heliopsis and Verbesina, frass is diffuse throughout, whereas on the oth- er hosts, there are more or less distinct, black, alternating strips in the later portion (Eiseman & Lonsdale 2018).

Puparium. Yellow to brown (dark brown according to Spencer 1969), formed outside the mine.

Phenology and voltinism. This species is multivoltine in the northeastern USA. We have collected larvae in early June, mid-July, early August, and late September, with adults emerging in 12–23 days in all cases except the last, when the pupae overwintered (Eiseman & Lonsdale 2018).

Distribution. Distribution. USA: CT, MA, MN, NY, OH, WI; Canada: ON (Eiseman & Lonsdale 2018).

Comments. This is the second Liriomyza species to be reared from Silphium, after L. ivorcutleri Eiseman & Lonsdale, which is known from a single Iowa specimen (Eiseman & Lonsdale 2018).