Our most common bumble bee in California is Bombus vosnesenskii. As you can see, it is quite attractive with its deep black base color and contrasting yellow abdominal band. It is one of 27 species that we have in the state.
This individual was out looking for nectar in January this year along the beach near Watsonville (Santa Cruz, County). This is one of the few bees that you can find at such times of the year. The habitat shot is of the ice plants along the beach where it was foraging.