Pseudomops septentrionalis
(Pale Bordered Field Cockroach).
Photo: 07/01/16, 11 pm.

The Pale Bordered Field Cockroach arrived in Florida within the last years but has been reported in Mississippi since 1987. The species entered the US from Mexico. It prefers low-growing herbaceous vegetation and seemingly does not infest houses. On occasion it visits flowers. This specimen was attracted by our porch lights.  
bug guide (this photo):
Miami News Times:
N. M. Schiff, T. L. Schiefer, Entomol. News 110, 240, 1990: