Akai,
Supposedly we have three different types:
brown widow spider - Latrodectus geometricus,
western black widow spider - L. hesperus, and
southern black widow spider - L. mactans.
Then there is Loxosceles rufescens, the Mediterranean recluse or violin spider which sends more people to the hospital than the widows.
I have never seen any of these and have this theory that if you live in peace with those 4-inch cane spiders (we have at least one in every room plus one in the truck) they will out-compete and/or eat the more poisonous species (
http://www.instanthawaii.com/cgi-bin...i?Animals.cane).
If you want a hoot, check out the happy face spider (
http://biology.swau.edu/faculty/petr...cards/spiders/)
steve