It's most likely the common "Daring jumping spider," Phidippus audax. It's completely harmless.
My guess is that this spider you saw was either a Jumping Spider (quite possibly a Daring Jumping Spider) or a Parson 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.
Black widow
thorn spider
Black Widdow Spider PS:I am A student in the 6th grade
a type of jumping spider?
No they are not, but they are some ill lookin lil fckers
Sounds like it might be what is called a"Daring Jumping Spider."
I got bit by a spider fitting this description, and hurt very bad. Very small, black spider with two very small dots on its back(side by side), but I don't know what kind it is..left a pretty good welt, and red dot on my leg.
R u sure its not a spider that has a red dot on its back? If it is, then its probably a black widow. If its a white dot, then i think its poisnous. Stay away from it unless u wanna get biten or die.
I just caught a spider that matches this description. After looking online, I think it may be a jumping spider from the family Salticidae. I believe that spider is Phidippus Audax a.k.a the Bold Jumping Spider.
This is the Phidippus audax, which is commonly known as the daring or bold jumping spider. They are found throughout most of the United States.