Thamnophis validus celaeno
Baja Sur, Mexico. September 1, 2013.
Found in rocky stream habitat in the foothills near Miraflores. Thamnophis or Nerodia? This fish-eating stream dweller has been in both, and is currently in Thamnophis.
Baja Sur 2013 album is here.
HerpMapper records for this species are here.