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Three flies talking about diptera.info :)

Taken on 13th July 2006 in Silgueiros - Viseu - PORTUGAL


Muscidae by sure... Musca domestica???

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I'd say domestica - female with narrow frontal orbits, male with eyes separated by more than the width of first flagellomere (third antennal segment)

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So, just we have one female and two males in this pic, right? :) Female is one above in relation to other 2 flies?

To split Musca in domestica and autumnalis, we just need see reddish hue in abdomen? (this case for autumnalis?) How can we have sure?

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No,we have two females (lower, with broader abdomens and wider frons) and one male (upper, with narrower abdomen and frons).
The colour of Musca domestica abdomen varies, often depending on where you are. Sometimes (as in your photo) both male and female have pale side patches. In autumnalis the male often has bright orange patches, but the female is all grey.
It's safer to rely on the relative widths of the frons and orbits. In autumnalis the male eyes are narrowly separated, and the female frontal orbits are very wide (each nearly as wide as the frontalia). In domestica the male eyes are separated by about twice the width of the third antennal segment, and the female orbits are only about a fifth the width of the frontalia.
And don't forget that although these are the commonest species, there are other species in Europe as well.