The brown recluse (No, the brown recluse is brown, not black. It also has black pattern on its back resembling a violin. Thus, the brown recluse's nickname of fiddle-back.)
a red back looks almost the same. But doesnt have an hourglass shape. It has a red stripe on top of its abdomen.
black widow
A black spider with a red back and thick fuzzy legs is commonly called a jumping spider. The formal name is Phiddipus audax.
Brown Widow Spiders. When the subject of dangerous spiders comes up, the average person usually thinks about the black widow spider. Their shiny black body with a prominent red hourglass marking on the underside of the abdomen is an image that readily comes to mind. Source: Google.com
it is a black widow. it is all black becausse only female black widows have the red mark on their back. this means that is a male black widow.
If its black, has a large butt and there's a red shape on its back the resembles an hourglass, then its a black widow spider and they are very poisonous
The American Black Widow should have nothing upon its back but the black color it is. Specfically, the hour glass is on the belly of the spider.
black widow
a red back looks almost the same. But doesnt have an hourglass shape. It has a red stripe on top of its abdomen.
Black widow
black widow
A black widow spider is black with a red mark on it's abdomen; this might or might not be what you meant. The black widow sometimes has a red mark on her back, as well. The red backed spider of Australia, a relative of the black widow, has an orange red mark on the back.
A black widow. This spider is only a black widow if the entire spider is black, with a round-ball looking back-body, female variety if there is a red hourglass shape marking on the underside of the spider. From the top black widows are completely black.
The black widow spider.
The hump on its back
A black spider with a red back and thick fuzzy legs is commonly called a jumping spider. The formal name is Phiddipus audax.
Brown Widow Spiders. When the subject of dangerous spiders comes up, the average person usually thinks about the black widow spider. Their shiny black body with a prominent red hourglass marking on the underside of the abdomen is an image that readily comes to mind. Source: Google.com