I think I heard somewhere that they don't have mosquitoes in California. I might have made that up, but I don't remember getting viciously bitten by them while I was there, so maybe there aren't. Which is great and all, but let's not forget that there are no black widow spiders in Massachusetts.
My night would be infinitely worse if I had just let dozens of black widows into the house. Thinking about it makes mosquitoes seem kind of peachy.