Mosquitoes. Big ones. Little ones. Some bite. Some don't.
Those that do are females because they need your blood to lay their eggs.
They need just a small amount of stagnant water to breed (unlike the moving water a black fly needs).
If you have a lot of rain, expect a lot of mosquitoes. If you don't....great...because their will be fewer of the blood sucking little devils.
And at dawn and at dusk, they home in on the carbon dioxide (CO2)you breathe out after flying a mile or more searching for a candidate to feed on. And if you are wearing bright colors, they find you quicker.
So how do we prevent or kill these little long legged winged blood collectors?
1. Remove standing water. Tear down any piles of used tires, cover the kids toys, create drains in stumps, urns, be certain gutters drain...all of these could harbor the larvae of the mosquitoes.
2. Fog/spray the adults. Fogging an area with pyrethum mixtures or (organic) spraying a garlic pepper and water mixture can kill the adult mosquitoes. Fogging is the method that community spraying programs undertake.
3. Fog, spray, oil, or Dunk the larvae. When the water area is too large to drain, fog or spray a very thin film of oil on the surface or use a commercial product such as Dunk that uses growth inhibitors to kill mosquito larvae. These products are available locally or on the internet.
4. Buy fish that eat their larvae. Another alternative is to use fish to eat the larvae. In some areas a fish named Gambusia is used for that purpose.
5. Get a machine that attracts them. There are many propane and CO2 emitters on the market locally or on the internet web sites that use these fuels to attract the mosquitoes into a trap area where they are killed quickly.