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Dear Rui,
Species of the genus Tachydromia Meigen are quite small, shining black or blackish brown, usually have wings with brown pattern and are found running about quickly on tree-trunks, logs, stones, sand, or leaves of lower herbage resembling in some respects small hymenopterans or ants (Chvála, 1970). The group is almost worldwide in distribution (unknown from Australia) and currently includes 107 species (Shamshev & Grootaert, in press). Nothing is known about larvae of these flies.