http://dermatology.cdlib.org/DOJvol3num2/centerfold/phidippus.HTML
http://entomology.unl.edu/images/spidersphidippus_aud2.jpg
i just found one of these in my yard in California and when i googled the description came across your question.
i am pretty sure this is what you saw as well. if it was they are actually pretty harmless even though they are absolutely horrific looking!!!!
the picture above will most likely give me nightmares.
thanks to global warming it sounds like they are migrating from the tropics!
A grey spider with a black stripe has a distinctive black stripe running along its body, which sets it apart from other spiders.
The distinguishing feature of a red spider with a black abdomen is the contrast between the red body and the black abdomen.
A black spider with a brown stripe has a distinctive marking that sets it apart from other spiders.
A black spider with a stripe on its back has a distinguishing feature of a visible stripe running along its body, which sets it apart from other spiders.
The distinguishing feature of a spider with a black stripe on its back is the presence of a distinct marking that runs along its dorsal side, typically in the form of a dark-colored stripe.
The cross spider has white crosses on his abdomen. Another North American spider with white on his belly is a parson spider who has a white stripe down his abdomen.
A grey spider with a black stripe has a distinctive black stripe running along its body, which sets it apart from other spiders.
The distinguishing feature of a red spider with a black abdomen is the contrast between the red body and the black abdomen.
A black spider with a brown stripe has a distinctive marking that sets it apart from other spiders.
A black spider with a stripe on its back has a distinguishing feature of a visible stripe running along its body, which sets it apart from other spiders.
Black Widow
The Red-back spider (Latrodectus hasselti) is commonly found in Australia. They are a small black venomous spider with long thin legs, and the females have a red stripe on their globular abdomen.
The spider described is likely a bold jumping spider (Phidippus audax). They are black with a distinctive white stripe, typically around the size of a quarter, and can display aggressive behavior if provoked. While they have the ability to bite, their venom is not considered dangerous to humans.
The distinguishing feature of a spider with a black stripe on its back is the presence of a distinct marking that runs along its dorsal side, typically in the form of a dark-colored stripe.
The small brown spider with a black stripe on its back can be identified by its unique coloration and marking.
i think it would b a tarantula
i think a black widow