The Texas Red-Headed Centipede is just as scary as it looks and sounds. Up to a foot long, its sting is usually not deadly, but it is very painful and can make you ill. They attack snakes, lizards and rodents.
Texas also has scorpions and tarantulas.
To identify these insects and more, look for a handy laminated brochure at the HEB checkout. Or, get this from Amazon: Unusual Insects of Texas $8.95