Xanthia sulphurago (Denis et Schiffermueller, 1775)
Tiliacea sulphurago (Denis et Schiffermueller, 1775)

The placement of this species in Tiliacea is doubtful. Both in imaginal and in larval characters the species is quite far from the type species of Tiliacea, Tiliacea citrago, and is rather similar to species in Xanthia. The species is undoubtedly congeneric with Tiliacea cypreago (not recorded from Germany) and is also similar to Tiliacea aurago. Beck (1991) has erected a separate subgenus Aurxanthia for Tiliacea aurago that could be elevated to genus rank and could also include the present species, but it is also possible that the present species actually belongs to Xanthia. The relationships of Xanthia and its allies requires a thorough revision using modern phylogenetic methods. Until more data about these relationships becomes available I provisionally retain the species in Tiliacea.