Steatoda grossa
(False Black Widow)

As a specific species the consensus is to call this one a False Black Widow. The similar spiders in family Theridiidae that are dark-colored, as a group, can be referred to as false widows. I’ve been using it wrong in my own IDs, I’ll be more specific in the future. Common names can be messy things. We keep them, in part, because many binomial scientific names are being changed rapidly with the availability of genomic testing changing the way organisms are classified. They used to be organized by behavior and body morphology instead of genetic ties.