This is the black stink bug, Proxys punctulatus, a relatively benign insect found over most of the southern US and down into the Carribbean. It’s about 12mm long, black, with spotted black and cream legs, with a long, pointy face, banded antennae, and a black body with a single white spot in the middle. Like all bugs in this family, they come equipped with a big ol’ proboscis (hidden under the body in this individual) which they use to pierce plants to feed on their juices. (Some have also been found eating the larvae of other insects.)
They like to eat cotton, soybean, and citrus plants, but never seem to gather in sufficient densities to do serious damage.