Bombus vosnesenskii (Radoszkowski, 1862), female - The Yellow-faced Bumble Bee Briggs Farm, Eugene, OR, April 23, 2010, on Camassia quamash (Greene, 1894) - Small Camas © Donald H. Gudehus

Bombus vosnesenskii (Radoszkowski, 1862), female - The Yellow-faced Bumble Bee Los Altos Hills, Santa Clara Co., CA, May 26, 2013, on poppy © Donald H. Gudehus

Bombus vosnesenskii (Radoszkowski, 1862), female - The Yellow-faced Bumble Bee Los Altos Hills, Santa Clara Co., CA, May 26, 2013, on poppy © Donald H. Gudehus