""the easiest way to distinguish the Blattellidae from the Blattidae are:
Underside of middle and hind femora always entirely and similarly spined on both sides (exception the Archiblattinae), pulvilli and arolia usually present.
Male:
Subgenital plate symmetrical (at most weakly asymmetrical), bearing two widely separated cylindrical styles at the postereolateral margins
Female
Subgenital plate symmetrical (valvular), bearing a pair of valve, divided by a longitudinal groove.""
Nice, detailed description. Maybe I missed something but which ones were you describing?