The western yellow-bellied racer (''Coluber constrictor mormon''),Wrobel, Murray (2004). ''Elsevier's Dictionary of Reptiles''. Elsevier. Page 122. . also known as the western yellowbelly racer or western racer, is a snake subspecies endemic to the Western United States, including California, Oregon, Nevada, New Mexico, Utah, Montana and Colorado. It is a subspecies of the eastern racer. It is nonvenomous and is recognized by its long and very slender shape. It is visually similar to the eastern yellow-bellied racer, which is also green, blue or brown with a recognizable yellow underside. Also named for its color, the western yellow-bellied racer is also gray with red or brown blotches when young.Cox, Douglas C. and Wilmer W. Tanner (1995). ''Snakes of Utah''. Brigham Young University. Page 28. .

References

Colubrids Fauna of the Western United States Reptiles of the United States Snakes of North America Reptiles described in 1852 {{Colubrid-stub