The worst kind.
I think it is white tail spider
A brown spider with a yellow stripe on its head is a wolf spider. The wolf spider may sometimes have an orange stripe on their head also.
your mummy spider
this is a common fishing spider... common to all of north America although not venomous they will bite if it feels threatened.
look up a green lynx spider
i think it would b a tarantula
Not enough information to answer this question without knwing location of spider and season.
it could be a Brown Prioia and its scientific name is Ortosomo Brunnem
USA
It may be a Garden orb-weaving spider, "Most are stout, reddish-brown or grey spiders with a leaf-shaped pattern on their fat, roughly triangular abdomens, which also have two noticeable humps towards the front. They sometimes have a dorsal stripe which may be white or brown edged with white." this is the site i found helped me. http://www.amonline.net.au/factSheets/orb_weaving_spiders.htm
You can by looking at their stripe of brown and seeing if it is big or small.
A garden spider, if it looks like this: http://i.pbase.com/v3/48/95248/1/48116303.GardenSpider5.jpg. Apparently a Argiope aurantia. We have them all over the place here and I've never heard of them being dangerous.
Spider monkey are kinda tiny they are usually black or brown. They have big eyes and small faces they are also sometimes really furry.