Wüsten-Beifuß
The larvae feed on "Artemisia tridentata". They mine the leaves of their host plant. The mine starts as a narrow linear mine along the margin of the leaf. The larvae leave this mine, forming small narrow mines along the margin of the leaf, entering the leaf on the upper side at or near the margin. Pupation takes place in a pale grey cocoon, spun on the underside of a leaf.