The female northern black widow is similar in color and size to its northern counterpart, but instead of an hourglass, the red on its body shows as splotches or dots.

The female northern black widow is similar in color and size to its northern counterpart, but instead of an hourglass, the red on its body shows as splotches or dots.

A female black widow spider (Latrodectus), hanging upside-down in her web, showing the red hourglass marking. Getty Images. By . ... Three of those species: northern black widows, ...

The female northern black widow is similar in color and size to its northern counterpart, but instead of an hourglass, the red on its body shows as splotches or dots.

The female northern black widow is similar in color and size to its northern counterpart, but instead of an hourglass, the red on its body shows as splotches or dots.

What happened next: Shortly after the woman arrived at the hospital, her symptoms intensified. Her eye continued to swell until it was almost entirely shut. Within 10 to 20 minutes of being admitted, ...

The female northern black widow is similar in color and size to its northern counterpart, but instead of an hourglass, the red on its body shows as splotches or dots.