This little bugger initially confused me with its raptorial front legs. “Raptorial” refers to enlarged femurs that are typically used to capture insect prey. Praying mantises and assassin bugs are perhaps the best known examples. My initial thought was that this was an assassin bug (family Reduviidae) but the overall morphology and lack of a restricted “neck” made me cautious.
After some research I was reminded that members of the superfamily Lygaeoidea can also have enlarged front femurs.
After some more research, I determined this insect is a member of the Rhyparochromidae, possibly Pseudopachybrachius basalis. If my identification is correct, they may be most common in association with panicgrass (Panicum sp., Poaceae). Although the front legs suggest they may be predatory, they actually feed on mature seeds.