Microsiphoniella Hille Ris Lambers
This genus is for about 4 species related to the palaearctic Microsiphum. All species of the group feed on Artemisia (including Serephidium), both shrubs and herbs. I note above that there are ‘about 4 species’ because using existing keys it is not clear how many species there are, and identification to species is generally challenging or misleading. This is one of many groups in western North America that could be cleared up with some relatively straight-forward concerted study.