Euploea dorippus Klug, 1845: species, semispecies, subspecies, junior subjective synonym of Danaus chrysippus chrysippus (Linnaeus), and/or form – what does Klug’s dorippus represent? (Lepidoptera: Nymphalidae, Danainae)

Four specimens of Danaus chrysippus collected during 1929 in NW Somalia by M. Portal Hyatt (NHMUK, London, BM 1929-534). Upperside left; halved underside right. a – female “10.10N, 45.45E, ca 1500 ft, Jan.” [NHMUK010241712]; b – male, same data as (a) [NHMUK010241710]; c – female, same data as (a) [NHMUK010241713]; d – female, “9.30N, 44.30E, 4000 ft, May.” [NHMUK010241711].