Juvenile Baja California rat snakes are prominently patterned.
In May of 1984, 2 miles east of Mountain Spring, Imperial County, California, a dead snake was found on Interstate 8. The snake was a Baja California rat snake, Bogertophis rosaliae. The finding of this specimen, before and since unknown to occur in the USA, then stirred much controversy. Controversy continues today with some researchers believing this locality to be genuine, but with the lack of other examples of this snake species north of the border causing other researchers to question the validity of the find.

There is, however, no question that the Baja rat snake, is a common species along almost the entire length of the peninsula for which it was named. And it is still hoped that its presence in the USA will someday be confirmed.

While hatchlings and juveniles of the Baja California rat snake are blotched dorsally, the adults of this bug-eyed snake, whether olive, lavender, or orange, are unicolored.

The genus Bogertophis is bitypic, with the only other species in the genus being the much better known Trans-Pecos rat snake, B. subocularis.