Liriomyza pistilla Lonsdale

(Fig. 149)

Material examined. MASSACHUSETTS: Franklin Co., Sunderland, Mt. Toby, 27.vi.2014, em. by 15.vii.2014, N. D. Charney, ex Melampyrum lineare, #CSE1183, CNC384842–384844 (3♂) ; Hampshire Co., Pelham, Butter Hill Wildlife Sanctuary, 2.vi.2015, em . 20–23.vi.2015, C.S. Eiseman, ex Melampyrum lineare, #CSE1635, CNC564685–564689 (3♂ 2♀); Nantucket Co., Nantucket, Masquetuck, 11.vi.2013, em . 26–30.vi.2013, C.S. Eiseman, ex Melampyrum lineare, #CSE610, CNC422920–422923 (1♂ 3♀).

Host. Orobanchaceae: Melampyrum lineare Desr.

Leaf mine. (Fig. 149) Whitish, upper surface; initially narrow and linear, then forming a blotch that may obliterate the linear portion. Frass is in scattered grains and short strips. The mines from Mt. Toby were rather different from others we have seen, consisting of long, linear mines contorted to form secondary blotches, with frass in alternating beaded strips.

Puparium. Yellowish; formed outside the mine.

Distribution. USA: MA, NC; Canada: AB, BC, NS, ON, QC.

Comments. This is presumably the species responsible for the unidentified linear-blotch mine on Melampyrum lineare that Spencer (1969) reported from Quebec.