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From looking things up, I encountered some photo which was taken in such a way that the sixth leg almost like like a stinger thing at the end of the body, making it look like a muskito.
Another thing I encountered and which I think you may all find very interesting is a paper titled Morphology and number of sensilla on the antennae and maxillary palps of different sized houseflies,
and here is the link of the pdf file; dissertations.ub.rug.nl/FILES/faculties/science/2001/f.j.kelling/c2.pdf I am sure you love it, it has some interesting closeup pictures in it.
Strangely enough, the hydrotaea irritans is mentioned in it as well, while the hydrotaea irritans doesn't appear to me as a housefly. I still haven't figured out for sure if it is the same as the quaedflieg, but it seems likely, for cattle has earprotection against them. Somehow the quaedflieg likes milkremains on the udders and thus transmits deceases. By the usage of earplugs of the cow the udders remain sterile(some sort of walkman but then for cows and not for music but for keeping the udders clean).
Well I hoped that with this link I contributed to your happiness.
thanks.