Liriomyza sp. 4

(Fig. 161)

Material examined. WISCONSIN: Buffalo Co., Alma, S 1287 State Road 88, 18.vii.2015, em. 2.viii.2015, C.S. Eiseman, ex Cirsium altissimum, #CSE1924, CNC564690 (1♀) .

Host. Asteraceae: Cirsium altissimum (L.) Hill.

Leaf mine. (Fig. 161) Entirely linear; whitish with black frass in strips and grains along the sides.

Puparium. Yellow; formed outside the mine.

Comments. The only Liriomyza species for which we have found definite North American rearing records from Cirsium are L. griffithsi Lonsdale (Alberta; leaf mine not described) and the western L. sabaziae Spencer, although L. huidobrensis (Blanchard) and L. trifolii (Burgess) have also been listed as occurring on this host (Lonsdale 2011, 2017). Our female specimen is not identifiable to species but does not match any of these four. The female is very glossy and pale, with only a small anteroventral spot on the anepisternum, a large yellow posterolateral margin on the scutum and yellow around the base of the vertical setae.