1. Tarrant County, Texas
2. 5/29/15
3. Forest Trail near suburban park. Found isolated
4. Length 11 mm
5. Coloration: Black head, brown middle and legs, black gaster. Fairly shiny, smooth, no hair. Not particularly distinct petiole.
I'm 80% sure this is a worker, but just to make certain. And figured it wouldn't hurt to find out what it was exactly either.
Sorry had trouble getting a top down picture.