While we were at Cape Lookout, we found this product. Many locals told us that it was the only thing that worked on the NC Mosquitos. Seemed to work well for us, although we do not have any technical documented facts. Just lots less mosquito bites. Back here at home, it seems to work well against the tiny no-see-ums here. Like I said, when they come out, I usually try to get inside or cover up. However this product is locally made in North Carolina, USA, and certainly smells a lot better than many of the others. Here is the link to their web page, and the product is widely available around the custal area.
SkeeterBeater