oa Journal of the Entomological Society of Southern Africa - New and little-known South African Rhagionidae (Diptera)
The Rhagionid genus Atherix is of peculiar interest on account of the gregarious habits exhibited by some of its species. The adults of both Atherix ibis and Atherix variegata are known to gather in dense, pear-shaped clusters on the ends of branches overhanging water where they oviposit and die. Enormous masses composed of eggs and dead flies may accumulate, new comers settling on the mass and ovipositing among the flies already dead.
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