I alluded to the love bugs that were swarming while we were at Siesta Key. They were not pleasant to have around. Luckily, when we had a light breeze, they disappeared.
Here's a photo from the web and a description from the same site: "These lovable little dipterans (they aren't actually "bugs" despite their common name) spend 5-7 months of their lives as larvae in the leaf litter. The adults emerge synchronously twice a year (April-May and September-October) and can form large swarms that cloud the air. Many people don't realize that these flies are actually invaders from Central America and have been working their way northward along the coast."