oa Journal of the Entomological Society of Southern Africa - Introduction
A detailed exposition on genera and species cannot be undertaken here. Among the Trypetidae species are generally well-defined, but such a statement is tentative since more material may reveal a greater number of intermediate forms. Specimens of a species from widely separated localities show very minor variations, and distinct, apparently geographical forms as in Pliomelaena brevifrons, are not common. At the same time, distinctions between species become less easy when they are more numerous in a genus, as in Isoconia.
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