An Adobe pdf version of the Eswatini Butterflies Checklist as at August 2013 is available here (click to view/download - approx 13 MB).

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314  Iolaus silas
      Southern sapphire
   

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Distribution: South Africa, from the Name Karoo in the East Cape, then along the eastern littoral from Addo Elephant to Somerset East and Bedford, along the coastal Savannah and Lowland Forest into KwaZulu-Natal.
Wingspan: males 32–37 mm females 34–41 mm
Foodplants: Erianthemum dregei
Flight Period: Adults are on wing year round in warmer areas and from September to January in the southern part of its range.

2 records, from 4/8/1949 to 4/9/1949

Distribution, food plant and other information from Woodhall, S. Field Guide to Butterflies of South Africa, Cape Town: Struik Publishers, 2005; Butterflies of South Africa's National Botanical Gardens, An illustrated checklist, compiled by Christopher Willis and Steve Woodall; Ivor Migdoll's Field Guide to the Butterflies of Southern Africa, Struik Publishers, 1987, with additional information from Pennington's Butterflies. Larval food plants quoted are restricted to those species recorded from Swaziland. Numbers for each species are from Pennington's Butterflies.