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So, let's get more complicated...

What about metallic green flies when the medial vein is not curving ?... :o

- Are there only Anthomyiidae and Muscidae, or are there other families too ?
- Are there "easy" (:p) criterias to distinguish families ?


Thanks for you patient explanations, Paul !
I do agree with cthirion : you're really precious to us ! ;)