Put some water in a white dinner plate and add a couple drops of Lemon Fresh Joy dish detergent. Set the dish on your porch, patio, picnic table, park bench, or other
outdoor area. Not sure what attracts them, the lemon smell, the white plate colour, or what, BUT ... mosquitoes flock to it, and drop dead shortly after drinking the Lemon Fresh Joy/water mixture, and usually within about 10 feet of the plate. TRY IT---it works! It may seem trivial, but it may also help to control mosquitoes around your home, (especially in areas where the dengue problem is threatening to reach epidemic proportions).
Pass this on to anyone who likes sitting out in the evening, or when they're having a cook out, or even to those cheapskates who want to save on mosquito coils & repellants!