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No, fly predators do absolutely nothing whatsoever for mosquitoes, their lifestyles never intersect with each other. They attack the (terrestrial) pupal stage of things such as stable flies (the ones that look like houseflies but bite, hard) and face flies and horn flies (the bitty little ones that cloud around the animals' faces). Fly predators can't get to mosquito pupae which are underwater (the stage that looks kind of like a sprouting bean seed), or deerfly or horsefly or greenhead pupae which are in mud or damp earth.
I know the whole "build a bat house for mosquito control" thing sounds good, but IME a) a lot more people build bat houses than get their bat houses *inhabited* (plus which, if you have an older barn as opposed to a pole-barn, you probably ALREADY have as many bats as you're gonna get, especially now with that white-nose disease going round), and b) I gotta tell you, we have both oodles of mosquitoes AND, until two years ago, oodles of bats BOTH on our property, and the two least-mosquitoey years have been the two past years which have been essentially batless (I think b/c of the disease coming thru). So while it can't HURT, I would not count on bat houses as a reliable mosquito control measure.
Pat