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Igor, I have looked further into the identification of this female. I found confirmed females of Hercostomus germanus, including one photographed in copula, and they seem very similar to my specimen.

In particular, the proboscis is distinctly longer in the female than in the male of H. germanus. In my specimen, proboscis/head length = 0.47 and proboscis/head height = 0.73. A photographed female of H. germanus gives approximately 0.40 and 0.60 respectively.

My specimen also has fore femur entirely yellow, apparently yellow fore coxa, and uniserial lower postocular setae. These characters seem difficult to reconcile with the male description of Ortochile barbicoxa.

Could this actually be a female of Hercostomus germanus?

Photo Diptera info :