Sceloporus undulatus, not sure what subspecies lives in Missouri. They are fairly easy to take care of. They mature out at about 4" snout-vent length, plus another 5-6" of tail. They need at least a 20 gallon long tank, a good UVB fluorescent bulb (like Repti-sun's 5.0), an incandescent basking light, water bowl, driftwood or tree limbs to climb on, a few rocks to bask on, and substrate for the bottom. I personally like ESU Jungle Mix lizard litter and use it in my Sceloporus tank.
They will eagerly eat large crickets and waxworms. About every 3rd meal, sprinkle some calcium powder for reptiles on the crickets before feeding.