Bombus occidentalis (IMAGE) University of California - Riverside Caption Bombus occidentalis, the Western bumble, used to be one of the most common bumble bees in California. The most recent statewide census did not locate it. Credit Rich Hatfield/Xerxes Society Usage Restrictions Credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.