The genome sequence of the Provençal Short-tailed Blue, Cupido alcetas (Hoffmannsegg, 1804) (Lepidoptera: Lycaenidae)

We present a genome assembly from an individual female <i>Cupido alcetas</i> (Provençal Short-tailed Blue; Arthropoda; Insecta; Lepidoptera; Lycaenidae). The assembly contains two haplotypes with total lengths of 493.02 megabases and 410.99 megabases. Most of haplotype 1 (99.32%) is scaffolded into 26 chromosomal pseudomolecules, including the W, Z ₁, and Z ₂ sex chromosomes. Haplotype 2 was assembled to scaffold level. The mitochondrial genome has also been assembled, with a length of 15.31 kilobases. This work is part of Project Psyche, a collaborative programme generating genomes for European butterflies and moths.