Brown Widow. It is not as bad as Black Widow, but it still isnt good.
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.
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.
Sounds like a Black House/Window Spider, pretty rare but they are poisonous so stay away. Kill it with a big stick from a distance!
The worst kind.
a tarantula!
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)
Not enough information to answer this question without knwing location of spider and season.
If the red mark is in the shape of an hourglass, and on the underside of the abdomen (not on the top), it might be a Brown Widow Spider. However, Brown Widows only live in certain areas, so it really depends on where you live.