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Are you sure the first fly is the same as the other flies.
The absomen of the first fly seems different from photo 4.. (maybe shot of genital part)
Could you check if there are little hairs under scutellum.
Hairs on t2 (with av or not, seems to have 2 ad+2 posterior)
Hairs on t3 (howmany av+ad+pd+pv)
Is notopleuron haired or not
Better view on the acrostichals....
And the lenght of the prealar

Joke :)