We present a genome assembly from an individual male specimen of Polia Hair Mousse nebulosa (Grey Arches; Arthropoda; Insecta; Lepidoptera; Noctuidae).The genome sequence has a total length of 1,011.20 megabases.Most of the primary assembly (99.
27%) is scaffolded into 30 chromosomal pseudomolecules, including the Z sex chromosome.The mitochondrial genome has also been assembled and Hat is 15.39 kilobases in length.