One of the most convincing ant mimics I have seen. Count the legs and the eyes. Salticidae: Myrmarachne, a genus of jumping spiders that mimic ants. It mimics the solitary black ants seen frequently on the same leaves. The interesting variation is the white marking at the top of the second leg that makes the cephalothorax narrowing look narrower (more like an ant). The spider is finishing a mostly digested meal of midge.
Tags: Salticidae Myrmarachne jumping spider ant mimic best ant mimic
Possibly Scutigerella immaculata that is distributed worldwide.