Insect and Spider Identification: CLOSED: New Spider Please Identify, 1 by SoCalMark

SoCalMark wrote:
Today on my way back home I noticed a spider sitting in a web on the porch, but unlike most spiders he set up a web on the steps of the porch. I went in to get my camera at that time he migrated into the window and was sitting in the corner, that's where the picture was taken. He is about 1.5" in diameter legs included, they were long, skinny, striped legs, also seemed to have some sort of red underbelly, but the spider was more brown not black like a black widow. When I went to get him out of his corner he curled up then when threatened began to move about very aggressively. Please identify and is he a threat to me and my family?