Ambush bugs are most plentiful around here (southwest Colorado and northwest New Mexico) in late summer. They come in a range of colors, from white to bright yellow to sort of calico, like these.
Ambush bugs are aptly named. They stand on flowers and wait to grab unlucky insects. Then they eat them.
Flower crab spiders tend to blend in with their surroundings. Not this one. Maybe it landed on the wrong flower.
Flower crab spiders are excellent hunters, and have no problem catching large insects. So when a beetle walked up I thought it was done for. But the spider let it walk on by, and they both went about their business.