mosquito hawk

The mosquito hawk or mosquito eater (or skeeter eater if you're a little bit country).

I was sad to read today that they're called crane flies and don't actually eat mosquitos at all.

I guess the only thing they're good for, then, is dying in my house and leaving a bunch of legs and wings all over the kitchen floor. We've let them in and let them fly all over the house a bunch of times so that they could kill the mosquitos - I feel a little bit stupid now :)