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Hint of red "cheek/jowl" face character of vicina. Compare with the dark, almost black "cheek/jowl" of vomitoria - see the faces in the gallery:p:p. Two equally common flies similar in almost all other respects.I think the hint is enough, (it could just be red hairs on black cheeks and therefore vomitoria) to say 90% vicina but as Gabor says :p try for lateral and head shots wherever possible.
Robert