The snakes of the family Boidae are mainly confined to tropical countries in their distribution. There are two subfamilies, the true Boas and the Pythons; of which the Boas belong to the Western Hemisphere and the Pythons almost exclusively to the Old World-a single species of the latter being found in Mexico. Of the true Boas, only four species are known to occur in North America, and these are all small. One of these species is found in the states of the Pacific Coast, ranging from Washington southward. It is known as the "Rubber Boa" and seems to be a burrowing species.
Proceedings of the Iowa Academy of Science
©1923 Iowa Academy of Science, Inc.
Guthrie, J. E.
"The Banana Snake Boa imperator,"
Proceedings of the Iowa Academy of Science, 30(1), 189-196.
Available at: https://scholarworks.uni.edu/pias/vol30/iss1/41