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I have quite a few photos of P. montivaga from last summer, and I agree this looks similar; but I also see a few differences:

a: in this fly the r-m crossvein seems to be at an oblique angle. In my photos it is short and straight across.

b: There seems to be a prominent bristle at the costal break. I can't see this in my pictures, though there is a series of short bristles.

c: In my photos the abdominal bristles are fewer and more regularly spaced (not more than 4 strong ones on T5, for example [EDIT: not true, Ive found one which shows more]), and the pale bands always seem to extend closer to the median line, often appearing continuous.

The other thing I am suspicious of is the size - I have not managed to achieve such depth of field for a live 3mm fly in natural light. Maybe I'm just jealous :

Another edit: Oh, I don't know, maybe this is all rubbish. Sorry I spoke:(