Phytomyza loewii Hendel

(Figs. 48, 193)

Material examined. MASSACHUSETTS: Franklin Co., Northfield, 276 Old Wendell Rd., 29.vi–2.vii.2016, em. 18.vii–2.viii.2016, C.S. Eiseman, ex Clematis virginiana, #CSE2778, CNC654120–654168 (23♂ 26♀); Northfield, 42.645962, -72.427679, 29.vi.2016, C.S. Eiseman, on Clematis virginiana, #CSE2646, CNC654108 (1♂).

Hosts. Ranunculaceae: Clematis ligusticifolia Nutt. (Frick 1959), C. * virginiana L.; adults caught on C. occidentalis (Hornem.) DC. (Spencer 1969).

Leaf mine. (Fig. 193) According to Spencer (1981), an “upper surface linear mine which gradually widens... and can appear as a blotch in small leaves”. The mines on Clematis virginiana begin with a small contorted portion that is initially on the lower leaf surface. They are whitish with frass in fine, closely spaced, black grains, sometimes forming beaded strips along the sides and sometimes more scattered. The larva exits through a slit on the lower leaf surface.

Puparium. (Fig. 48) Brownish, deeply segmented; formed outside the mine (Spencer 1981). In the field, the puparium was often found loosely attached to the lower leaf surface near the exit slit.

Distribution. USA: CA, DC, GA, ID, IN, LA, *MA, WA; Canada: QC.