Dark transverse bars on the nape (the first one right behind the parietals): Eastern.
No such bars: Western.
The location of capture could also be determining. According to field guides, both subspecies share TX approximately as follows: flagellum in the Eastern quarter of the State, elsewhere testaceus. It of course might be an intergrade.
Should you keep it, I hope you get much pleasure from you new captive.

Regards,

Benjamin.