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Chrysops silacea Austen, 1907
This species of deer flies is found in Central and West Africa, where it transmits Loa loa, a filarial nematode that causes loiasis in humans (African eye worm). The nematode usually moves into the skin during the day and into the lungs during the night. It can also migrate into the eye, causing inflammations and less often, blindness.
Chrysops silacea bites during the day when the parasitic worms are found near the skin. The disease is also transmitted by Chrysops dimidiata, a smaller species. Both species of deer flies have a similar distribution and occupy similar habitats in the rainforest.