Bogertophis rosaliae - Baja California Rat Snake

Adult, Baja California, courtesy of Victor Valasquez,
El Serpentario de La Paz

References:

Grismer, L. Lee. Amphibians and Reptiles of Baja California, Including Its Pacific Islands and the Islands in the Sea of Cortés. The University of California Press, 2002.

McPeak, Ron H. Amphibians and Reptiles of Baja California. Sea Challengers, 2000.

San Diego Natural History Museum