Deb, are they these?:
http://entnemdept.ufl.edu/crea...
IDK if they're exactly the same where you are or not, but those things got me last Saturday along FL gulf coast and I'm still scratching. I only live about 90 minutes from the beach, so visit often, but have never run into a swarm like that before, or been bit by anything on the beach besides a crab. It was our 6th time camping in that state park and I hope they are gone when we go again @ the end of this month. And speaking of dermatitis, the park is full of poison ivy. We just don't touch it!