Those are called SNOT flies...cuz it's SNOT fun fishing when those things are biting like that LOL
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The house fly's have been very bad this year.....driving me nuts.......those flys offshore bury there eggs and spawn out of whale poop.....that's why they are the worst when you are on the whale(tuna) grounds...........

Well then they're #^&#^&#^&#^& flies ;)
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That they do. The fly problem is pervasive. While fluking out of Pt. Judith the other day, they were all over the boat and biting our ankles. At one point I knew I wasn't the only boat pestered when someone over the radio issued a general complaint about the fly inundation.

Sounds like deer flies to me. Don't wear dark colors or blue.
They should start to go away after the August full moon.
There so thick down Monomy that they can cary a small child away

Shorty boots and oil skins help alot

Deer fly - Wikipedia, the free encyclopedia

These?

Boat flies don't count.

if those are them, a dude showed me a trick for them. Get a bright Blue Bucket and coat it w/ something really sticky. They can't lay off the color blue and when they land on it.....they're stuck.

Guy showed me how it worked and I'd say in 2 minutes max he had to have at least 40 of the fuggers stuck to the bucket

Definitely not those- at least the ones that savaged me. I think Mikey is right that they're stable flies.

Stable fly - Wikipedia, the free encyclopedia

Looked identical to a housefly, except with a sharp pointy bit for a mouth. And RR is right, they were slow and easy to kill, but there was no end to 'em

No problem with flies off of Pt. Judith yesterday. I only noticed one on the boat all day.

Definitely not deer, horse, or greenheads. I think those lil basstages are fast though. They look like a tiny housefly. I heard they laid down a bit at Race PT. Yesterday. Maybe it had something to do with that crazy heat wave. It strikes me odd that everyone in such a wide spread area from north to south and land to sea had such an issue with them on Sunday?? Two tornados in Western MA this year as well. Something funky is going down.