Iolaus alienus, the brown-line sapphire, is a butterfly of the family Lycaenidae. It is found in most of Sub-Saharan Africa.
The wingspan is 33–37 mm for males and 35–40 mm for females. Adults are on wing from August to November (with a peak in September) and sometimes again from April to May in South Africa. There are two generations per year.[1]
Larvae have been reported on Loranthus species. The larvae of subspecies I. a. alienus feed on Tapinanthus brunneus, Tapinanthus subulatus, Oliverella rubroviridis and Helixanthera kirkii.