That species of fly I posted on my Facebook yesterday, I got an e-mail this morning regarding my enquiries to the entomologist At the Department of Conservation is not sure but it may be a new species and they want to examine the specimen.
Quite exciting, the New Zealand CFZ may have discovered a new species of fly or a hereto unknown immigrant.
I shall keep you informed.
As Lars said in his reply(*) it does have a fungal infection but the veins on the wings match an unusual species.
(*) Lars Thomas I cant identify the fly for you, I am not familiar with NZ flies, but the poor thing has a severe fungus infection, thats the reason for the white stripes in between the dark ones. His abdomen (It looks like a he because of the big eyes) is swollen with fungus threads, pressing on the outer plates and even sticking out here and there.