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Thank You for the information about the various Musca. I've saved the data to a text file. I didn't know about M. larvipara. Definitely a possibility. I suspect that this is M. autumnalis because I remember the gena is very hairy. I will look at the suprasquamal ridge tomorrow. I'm too tired to go to the microscope tonight. I'll update this post tomorrow.

Thank You Sir Stephane. see you tomorrow...