“...I’ve read that the summer black-flies in the interior of the island are legend....”
I don’t know about there, but if they’re anything like the black-flies in eastern Maine around June, I can personally attest that they are fricken’ brutal. The air can get so heavy & thick with em, you accidentally inhale them while breathing. Their bite is worse than a mosquito bite....real nasty littler boogers. But usually by July, they’re pretty much gone. I don’t know what’s worse: Maine black flies or Louisiana love bugs. Both are nasty.
Back in the early 70’s the Florida Turnpike was thick with love bugs, clouds of them. The rest stops had windshield washers installed and a lot of people put bug screens across the front grill to keep the smashed critters from clogging up radiators.