Xanthia            Noctuidae, Cuculliinae
Xanthorhoe         Geometridae, Larentiinae
Xanthotype         Geometridae, Ennominae
Xenomicta          Oecophoridae
Xestia             Noctuidae, Noctuinae
Xylena             Noctuidae, Cuculliinae
Xylomyges          Noctuidae, Hadeninae
Xyrosaris          Yponomeutidae