Abstract
We present a genome assembly from an individual male Lymantria monacha (the black arches; Arthropoda; Insecta; Lepidoptera; Erebidae). The genome sequence is 916 megabases in span. The majority of the assembly (99.99%) is scaffolded into 28 chromosomal pseudomolecules, with the Z sex chromosome assembled. The mitochondrial genome was also assembled, and is 15.6 kilobases in length.