Bombus occidentalis (IMAGE) Entomological Society of America Caption This is a Bombus occidentalis on a flower. Credit Stephen Ausmus, USDA-ARS Usage Restrictions Must credit Stephen Ausmus, USDA-ARS. License Licensed 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.