If it's pretty small, it could just be a house spider, which are harmless, but if it about the size of a quarter, it could be a brown recluse, whose venom rots flesh. So careful.
The brown recluse spider is the kind of spider that has a brown oval mark on its back. This spider's bite is extremely deadly to animals and humans.
the pupu spider
A Garden Spider
The spider that is black with a white crescent on its back is the Brown House Spider. This spider is often confused with the red-back spider.
The worst kind.
a tarantula!
One that is walking backwards
An Arrowhead spider is brown with a green back. This spider is also known as a Triangle Orb Weaver. This spider is not venomous.
it is black light brown and hair............
i think it would b a tarantula
that is either a jumping spider rarely found,but common in mohave desert and in other many deserts (their feather like skins blandes them with the surroundings)
Brown Widow. It is not as bad as Black Widow, but it still isnt good.