I heard that these mosquitoes tend to feed within a couple of feet of the ground, so wear long pants and use a DEET-containing insect repellent.
They showed up in the Tucson area at least 25 years ago, but I hardly ever see any.
In Kern County California they have been really bad for many years. Just walk out in the yard with capris on and wind up with many bites on the legs. Yeah, they bite low. And it seems like their bites itch much worse than regular mosquitos.