No other tiger beetle looks quite like them, not only are they very large for a tiger beetle, they are a dark metallic green from the tip of their head to the tip of their abdomen. The legs, antennae, and mandibles are tan. Eyes are bulbous and dark.
Like all tiger beetles they are incredibly fast and difficult to get a good look at. Most tiger beetles can fly, but like all tiger beetles in the genus Tetracha they are flightless, or very poor flyers. They seem to rely on their rapid running abilities. They are often found near rivers and lakes. They also occur in suburban areas in lawns, open grassy areas and bare ground. I found the one pictured here alongside the Missouri River in St. Joseph. It was scurrying along the sidewalk right outside where I work.
As both grubs and adults they feed on various insects. Many tiger beetles in this genus seem able to "hear" or sense the underground activity of insects living in the soil. This ability helps them locate potential prey. Their feeding habits can help biologically control things like June Beetles or Mole Crickets (that may be feeding on your turf) while they are still in the grub stage.