The upperside of the forewings is tawny in the basal area, with a broad ochraceous orange post-discal band and a black wide border.

[4] Seitz-The discal band of the upper surface is dark orange-yellow; the tails of the hind wing only 3—4 mm.

[6] Subspecies include:[2] Life-sized colour plates and description of the larval and pupal stages of C. pollux and additional related species, illustrated by Dr. V. G. L. van Someren, are readily available.

More recent taxonomic revision,[18] corroborated by phylogenetic research, allow a more rational grouping congruent with cladistic relationships.

Within a well-populated clade of 27 related species sharing a common ancestor approximately 16 mya during the Miocene,[19] 26 are now considered together as The jasius Group.

[18] One of the two lineages within this clade forms a robust monophyletic group of seven species sharing a common ancestor approximately 2-3 mya, i.e. during the Pliocene,[19] and are considered as the jasius subgroup.