Was found on the side of a piece of a two by four by a house I was building. Would live to know what kind it is, it’s a fine specimen very shiny.
It is the Northern Black Widow. Southern Black Widow has one red spot.
Sadly, those red spots are not a key to identity, Yes, a sub adult southern black widow can look just like this and given the location, a more likely species. When they molt to full adult, they often loose these dorsal spots and become completely black. My western black widow had similar spots,nearly gone at penultimate and completely black at adult.
No question this is one of the black widows,western least likely, northern possible but questionable.
Ideally in the range of southern black widow.
Wanda, my resident Latrodectus hesperus with her mate and recent molt:
Looks like a black widow spider to me because of the shiny black and the red spots. Best not to be handled if it is black widow. But also it could be a cobweb spider