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Hello again,

Always good to ask questions to learn new, so don't apologize! The coloration and other funny features on the third fly are also due to the fact that the fly has recently emerged from the pupa. It might take surprisingly long for some individuals to develop final colour and appearance. These flies (as well as others like them) use so called ptinal pouch (not sure what the real term is) to crack open the puparium. This pouch retracts, leaving a ptinal suture. You can see partly retracted pouch on the fly 3, making the frons also look wider. I think all the flies are females.