Iolaus silarus, the straight-line sapphire, is a butterfly of the family Lycaenidae. It is found in Mozambique, Zimbabwe, Botswana, Namibia, Malawi, Zambia, southern Zaire, Tanzania, south-western Kenya and South Africa. In South Africa it is found in wooded savannah in northern KwaZulu-Natal and in savannah from Swaziland to Mpumalanga, Limpopo and North West. It is also present in Afromontane forest on the Wolkberg and the northern Drakensberg.
The larvae feed on Erianthemum dregei.
- Iolaus silarus silarus (Swaziland, Mozambique, Zimbabwe, Botswana, Malawi, Zambia, Democratic Republic of the Congo: Shaba, Tanzania, southern Kenya, South Africa: Limpopo Province, Mpumalanga, North West Province, KwaZulu-Natal)
- Iolaus silarus brainei Henning & Henning, 1984 (northern Namibia)
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