Agromyza pseudoreptans Nowakowski

Material examined. MASSACHUSETTS: Franklin Co., Northfield, 276 Old Wendell Rd., 26.x–1.xi.2017, em. 2–8.v.2018, C.S. Eiseman, ex Urtica dioica, # CSE4463, CNC1135695–1135702 (3♁ 5♀) .

Photographed mines. IOWA: Linn Co., Cedar Rapids / ICNC, 6.xi.2011, J. Zito, Urtica dioica [vacated mine], BG 592789 ; MARYLAND: Harford Co., Susquehanna State Park, 28.v.2018, J. Emm, Urtica dioica, BG 1527598 .

Host. Urticaceae: Urtica dioica L.

Leaf mine. A dark greenish linear-blotch, turning brown; following the leaf margin for several serrations and

then expanding away from it. The egg is often laid near the leaf margin but may be laid along a lateral vein away from the margin, in which case the initial linear portion meanders until reaching the margin. Frass is deposited in numerous irregular, dark lumps.

Puparium. Brown; formed outside the mine.

Phenology and voltinism. This species is bivoltine, with a summer pupal diapause and an exceptionally latefeeding fall generation. A photograph taken in Maryland shows an occupied mine on 28 May. A larva collected in Vermont in late June emerged as an adult in mid-October (Eiseman & Lonsdale 2018). Larvae of our new reared series were active in Massachusetts from late October into early November, and in Washington we found larvae feeding as late as 3 December 2018.

Distribution. USA: AK, CA, [IA], ID, *MA, [MD], MN, OR, VT, WA; Canada: AB, BC, MB, NT, ON, QC; Europe; Georgia, Kazakhstan; Russian Far East (Nartshuk & von Tschirnhaus 2017; Eiseman & Lonsdale 2018).