The genome sequence of the Provence Hairstreak, <i>Tomares ballus</i> (Fabricius, 1787) (Lepidoptera: Lycaenidae)

We present a genome assembly from a male specimen of <i>Tomares ballus</i> (Provence Hairstreak; Arthropoda; Insecta; Lepidoptera; Lycaenidae). The assembly contains two haplotypes with total lengths of 839.94 megabases and 831.10 megabases. Most of haplotype 1 (99.02%) is scaffolded into 23 chromosomal pseudomolecules, including the Z sex chromosome. Haplotype 2 was assembled to scaffold level. The mitochondrial genome has also been assembled, with a length of 15.43 kilobases. This work is part of Project Psyche, a collaborative programme generating genomes for European butterflies and moths.