Phytomyza flavicornis Fallén

(Fig. 57)

Material examined. IOWA: Winneshiek Co., Roslien Woods, 1.ii.2018, em. 18.ii.2018, J. van der Linden, ex Urtica dioica, # CSE4943, CNC1643673–1643674 (1♁ 1♀) .

Hosts. Urticaceae: Urtica dioica L.; adults have been caught on U. gracilis Aiton (Spencer 1969) .

Larval biology. The larva bores in the pith of the stem and roots.

Puparium. (Fig. 57) Slender and yellowish, with deep intersegmental grooves; formed within the stem.

Phenology and voltinism. Pupae overwinter, with adults emerging in spring. Collection dates for adults range from 23 April in Oregon to 7 July in Manitoba (Spencer 1969; Spencer & Steyskal 1986).

Distribution. USA: *IA, IN, MI, OR; Canada: AB, MB, ON; Europe (Spencer 1969; Spencer & Steyskal 1986).