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I'm working on it Tony. :D

Thanks for your info cyprinoid, I had read your thread.

A few pointers here, colour of the anterior spiracle varies a great deal even in vicina. Colour or intensity of colour of the basicosta can vary somewhat too, maybe this is due to age. I would imagine a newly emerged fly might have different colouring than one which has aged.

I have selected some of my photos to show how the anterior spiracle can vary.

First, look at the spiracle in the view showing the right side, it wasn't getting the sun glaring on it but I used the flash. It looks to be pale brown.