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Tiny - 3mm - black-and-beige bodied fly scuttling around on leaf-litter in Lusaka East (Zambia), close to a couple of artificial ponds but not so close as to clearly indicate association. Flicked its wings a lot.

Present from April-August at the very least. On one occasion, two of them seen within about 10cm of each other (whether either was responding to the other was unclear).

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another image (April)

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And a similar fly in August:

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From what's visible here (no. and position of white spots in discal cell and cell r1, scutellum dark-brown apically) should be A. decemguttatus (Bezzi), cf. Dikow & Mathis, 2002 (Proc. Entomol. Soc. Wash., 104(2): 249-290)

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Thanks!