Callophrys avis, the Chapman's green hairstreak[2] is a small butterfly found in the Palearctic (Southwest Europe, Algeria, Morocco, Tunisia) that belongs to the blues family.

[3] The males and females of this little butterfly are identical.

The underside of the wings is green, the upperside is greyish brown.

The green verso is marked by a mediodiscal white line that differentiates this species from Callophrys rubi.

The larva feeds on Coriaria myrtifolia, Arbutus unedo, Salvia verbenaca, Viburnum tinus.