Agromyza parca Spencer

(Fig. 72)

Material examined. MASSACHUSETTS: Franklin Co., Northfield, 276 Old Wendell Rd., 24.vi.2017, em. 11– 17.vii.2017, C.S. Eiseman, ex Glyceria striata, #CSE3913, CNC939665–939669 (1♂ 4♀) ; Hampshire Co., Pelham, Arnold Rd., 2.vii.2013, em. 20–22.vii.2013, C.S. Eiseman, ex Dichanthelium clandestinum, #CSE724, CNC392666, CNC392667 (1♂ 1♀) ; Middlesex Co., Townsend, 42.68888526, -71.75159779, 19.vii.2017, em. 3– 4.viii.2017, C.S. Eiseman, ex Glyceria canadensis, #CSE4062, CNC939729–939731 (2♂ 1♀); Plymouth Co. , West Bridgewater, Maple St., 15.viii.2013, em. 2–5.ix.2013, C.S. Eiseman, ex Dichanthelium clandestinum, #CSE866, CNC392683–392687 (2♂ 3♀) ; same collection data, em. 20–23.iv.2014, #CSE1089, CNC384728, CNC384729 (2♀).

Hosts. * Poaceae: Dichanthelium clandestinum (L.) Gould, Glyceria canadensis (Michx.) Trin., G. striata (Lam.) Hitchc.

Leaf mine. (Fig. 72) Eggs are inserted near the leaf margin, associated with a cluster of feeding punctures. The gregarious larvae initially mine along the margin toward the apex, then turn around and form a large, dirty whitish upper surface blotch with generally distributed, liquidy, greenish to brown frass. Concentric feeding lines are present in some mines. The mines on Glyceria striata were on the lower leaf surface.

Puparium. Yellowish-brown to reddish-brown; formed outside the mine.

Distribution. USA: *MA, NC, TN.