Do some black widows have an orange stripe on their back?

You didn't say where you live. There are over 30 species worldwide, so where you are could make a big difference. I've looked through some images, but haven't found an example with stripe and spots. read more

Both black widows and brown widows are almost never found in homes. In garages, black widows are common but brown widows are not. Outside and around the home, both spiders are very common. The brown widow appears to be displacing the black widow in some of its habitats, especially in urban areas. read more

The brown widow can have some orange in that longitudinal stripe but it will never be bright red. Below will be a series of pictures of brown widows then black widows to show you the great variation in each species as they mature. Realize that distinguishing the two species takes lots of practice and examining lots of specimens. read more