Giant desert centipede--Scolopendra heros. Range: California west to Louisiana, north to Missouri, Oklahoma and Kansas.
The term, desert, is a misnomer for they also live in other habitats. They are closely related to S. gigantea shown above?-page 2. S. heros gets to about 6 inches long and 1 1/2 inches wide including the legs.
S. heros are fast and considered agressive?-whatever that means?-and as other Scolopendra, the feet are tipped with sharp claws that make tiny incisions as they walk across your skin. Should they be upset while they do this, they will drop venom onto the cuts causing an irritation.
Bites from this centipede are very painful but not dangerous, and the symptoms will greatly lessen after 15 minutes or so.
The female lays her eggs in a clutch and coils her body around them with the feet inward. The picture shows the neonates on the mother's ventral surface as she is uncoiling.
Though this centipede is common in Texas, I have only seen two, one alive and one dead, near San Saba, Texas. (central Texas)